Java图形用户界面设计

1.用AWT和布局管理器设计如图所示调色板界面，点击加减按钮能改变颜色值中各色值的分量，下面面板的颜色同步改变。

package com.yjq.lesson06;

import java.awt.*;
import java.awt.event.*;

public class Test_3 extends Frame {
    //三个标签
    Label l1,l2,l3;
    //六个按钮（三个➕，三个➖）
    Button b1,b2,b3,b4,b5,b6;
    //三个文本框
    TextField tf1,tf2,tf3;
    int count1,count2,count3;
    Color c;
    //实现接口中的方法actionPerformed和textValueChanged
    private class changeText implements ActionListener, TextListener
    {
        public void actionPerformed(ActionEvent e){
            if(e.getSource()==b1){tf1.setText((count1++)+"");}
            if(e.getSource()==b2){tf2.setText((count2++)+"");}
            if(e.getSource()==b3){tf3.setText((count3++)+"");}
            if(e.getSource()==b4){tf1.setText((count1--)+"");}
            if(e.getSource()==b5){tf2.setText((count2--)+"");}
            if(e.getSource()==b6){tf3.setText((count3--)+"");}
            int c1=Integer.parseInt(tf1.getText());
            int c2=Integer.parseInt(tf2.getText());
            int c3=Integer.parseInt(tf3.getText());
            if(c1>=255) {c1=0;count1=0;}
            if(c2>=255) {c2=0;count2=0;}
            if(c3>=255) {c3=0;count3=0;}
            c=new Color(c1,c2,c3);
            p1.setBackground(c);
        }
        public void textValueChanged(TextEvent e) {
            c=new Color(Integer.parseInt(tf1.getText()),Integer.parseInt(tf2.getText()),Integer.parseInt(tf3.getText()));
            p1.setBackground(c);
        }
    }
    //两个面板
    Panel p=new Panel();
    Panel p1=new Panel();
    //设置布局
    GridBagLayout gbl=new  GridBagLayout();
    GridBagConstraints gbc=new GridBagConstraints();
    //构造器
    public Test_3()
    {

        setSize(500, 400);
        p.setLayout(gbl);
        gbc.fill=GridBagConstraints.BOTH;
        this.setLabel();
        this.setButton_add();
        this.setTxetField();
        this.setButton_sub();
        this.setPanel();
        add(p);
        setVisible(true);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e)
            {
                System.exit(0);
            }
        });
    }
    private void setPanel() {
        gbc.weightx=10;
        gbc.weighty=10;
        gbc.gridx=0;
        gbc.gridy=4;
        gbc.gridwidth=4;
        gbc.insets=new Insets(10,10,10,10);
        p1.setBackground(new Color(220,220,220));
        gbl.setConstraints(p1, gbc);
        p.add(p1);

    }
    private void setButton_sub() {
        b4=new Button("-");
        b5=new Button("-");
        b6=new Button("-");
        b4.setFont(new Font("宋体",Font.PLAIN,20));
        b5.setFont(new Font("宋体",Font.PLAIN,20));
        b6.setFont(new Font("宋体",Font.PLAIN,20));
        gbc.gridx=3;
        gbc.gridy=0;
        gbl.setConstraints(b4, gbc);
        gbc.gridy=1;
        gbl.setConstraints(b5, gbc);
        gbc.gridy=2;
        gbl.setConstraints(b6, gbc);
        p.add(b4);
        p.add(b5);
        p.add(b6);
        b4.addActionListener(new changeText());
        b5.addActionListener(new changeText());
        b6.addActionListener(new changeText());

    }
    private void setTxetField(){
        tf1=new TextField(5);
        tf2=new TextField(5);
        tf3=new TextField(5);

        tf1.setText("220");
        tf2.setText("220");
        tf3.setText("220");

        count1=Integer.parseInt(tf1.getText());
        count2=Integer.parseInt(tf1.getText());
        count3=Integer.parseInt(tf1.getText());

        gbc.weightx=1;
        gbc.weighty=1;
        gbc.gridx=2;
        gbc.gridy=0;
        gbl.setConstraints(tf1, gbc);
        gbc.gridy=1;
        gbl.setConstraints(tf2, gbc);
        gbc.gridy=2;
        gbl.setConstraints(tf3, gbc);

        p.add(tf1);
        p.add(tf2);
        p.add(tf3);

        tf1.addTextListener(new changeText());
        tf2.addTextListener(new changeText());
        tf3.addTextListener(new changeText());

        this.setKeyPress(tf1);
        this.setKeyPress(tf2);
        this.setKeyPress(tf3);
    }
    private void setKeyPress(TextField tf)
    {
        //具体看addKeyListener的使用方法和说明
        tf.addKeyListener(new KeyAdapter() {
            public void keyPressed(KeyEvent e)
            {
                char ch = e.getKeyChar();
                if(!(ch>='0'&&ch<='9'))
                {
                    e.consume();
                }
            }
        });
    }
    private void setButton_add() {
        b1=new Button("+");
        b2=new Button("+");
        b3=new Button("+");
        b1.setFont(new Font("宋体",Font.PLAIN,20));
        b2.setFont(new Font("宋体",Font.PLAIN,20));
        b3.setFont(new Font("宋体",Font.PLAIN,20));
        gbc.insets=new Insets(10,80,10,10);//组件间间距
        gbc.gridx=1;
        gbc.gridy=0;
        gbc.weightx=1;
        gbc.weighty=1;
        gbl.setConstraints(b1, gbc);
        gbc.gridy=1;
        gbl.setConstraints(b2, gbc);
        gbc.gridy=2;
        gbl.setConstraints(b3, gbc);
        p.add(b1);
        p.add(b2);
        p.add(b3);
        b1.addActionListener(new changeText());
        b2.addActionListener(new changeText());
        b3.addActionListener(new changeText());
    }
    private void setLabel()
    {
        l1=new Label("红色", Label.CENTER);
        l2=new Label("绿色",Label.CENTER);
        l3=new Label("蓝色",Label.CENTER);
        l1.setBackground(Color.RED);
        l2.setBackground(Color.GREEN);
        l3.setBackground(Color.BLUE);
        gbc.gridx=0;
        gbc.gridy=0;
        gbc.weightx=1;
        gbc.weighty=1;
        gbc.insets=new Insets(10,10,10,10);
        gbl.setConstraints(l1, gbc);
        gbc.gridy=1;
        gbl.setConstraints(l2, gbc);
        gbc.gridy=2;
        gbl.setConstraints(l3, gbc);
        p.add(l1);
        p.add(l2);
        p.add(l3);
    }
    public static void main(String[] args) {
        {
            new Test_3();
        }
    }
}
//GridBagConstraints.insets： 此字段指定组件的外部填充，即组件与其显示区域边缘之间间距的最小量。

GridBagLayout参数
一个组件在父容器中的位置，由其设置的GridBagLayout的参数决定，而GridBagLayout参数封装在GridBagConstraints类中，其主要成员变量如下：

与组件所在方格相关的参数

如下图所示，父容器被分割成3*3的表格，各行各列占比如图中小数所示，然后在该容器中分别放了方格1，方格2，方格3，以方格3为例，其gridx=0，gridy=2，gridwidth=2，gridheight=1，weightx=0.2，weighty=0.5。

示意图

gridx = 2; // X2
gridy = 0; // Y0
gridwidth = 1; // 横占一个单元格
gridheight = 1; // 列占一个单元格
weightx = 0.0; // 当窗口放大时，长度不变
weighty = 0.0; // 当窗口放大时，高度不变
anchor = GridBagConstraints.NORTH; // 当组件没有空间大时，使组件处在北部
fill = GridBagConstraints.BOTH; // 当格子有剩余空间时，填充空间
insert = new Insets(0, 0, 0, 0); // 组件彼此的间距
ipadx = 0; // 组件内部填充空间，即给组件的最小宽度添加多大的空间
ipady = 0; // 组件内部填充空间，即给组件的最小高度添加多大的空间
new GridBagConstraints(gridx, gridy, gridwidth, gridheight, weightx, weighty, anchor, fill, insert, ipadx, ipady);

API使用(具体看API文档，实现编写过程中IDEA自动提示重写接口中方法)
addKeyListener
public void addKeyListener(KeyListener l)

添加指定的按键侦听器，以接收发自此组件的按键事件。如果 l 为 null，则不会抛出异常并且不执行动作。
java.awt.event
接口 KeyListener
用于接收键盘事件（击键）的侦听器接口。旨在处理键盘事件的类要么实现此接口（及其包含的所有方法），要么扩展抽象 KeyAdapter 类（仅重写有用的方法）。

然后使用组件的 addKeyListener 方法将从该类所创建的侦听器对象向该组件注册。按下、释放或键入键时生成键盘事件。然后调用侦听器对象中的相关方法并将该 KeyEvent 传递给它。

方法摘要
void keyPressed(KeyEvent e)
按下某个键时调用此方法。
void keyReleased(KeyEvent e)
释放某个键时调用此方法。
void keyTyped(KeyEvent e)
键入某个键时调用此方法。

2．利用Swing包创建一个窗口，窗口位置为(220,160)、大小为320×240，并在窗口(20,80)、(120,80)、(220,80)处各设置一个按钮，按钮大小为80 X 40。点击左按钮将窗口背景的红色分量增加10，点击中间按钮将窗口背景的绿色分量增加10，点击右按钮将窗口背景的蓝色分量增加10，上述三种分量大于255时变成0，下面面板的颜色同步改变，点击窗口关闭按钮时退出程序运行。

package com.yjq.lesson06;
//import java.awt.Color;
//import java.awt.event.ActionEvent;
//import java.awt.event.ActionListener;
//import java.awt.event.WindowAdapter;
//import java.awt.event.WindowEvent;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Test_4 extends JFrame {
    //三个按钮
    JButton jb1,jb2,jb3;
    //三原色初始值
    int r=100,g=100,b=255;
    JPanel jp=new JPanel();
    Test_4()
    {
        jp.setBackground(new Color(r,g,b));
        jp.setLayout(null);
        this.setSize(320, 240);
        this.add(jp);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosed(WindowEvent e)
            {
                System.exit(0);
            }
        });
        //对三个按钮的设置
        jb1=new JButton("红色");
        jb2=new JButton("绿色");
        jb3=new JButton("蓝色");
        jb1.setBackground(Color.RED);
        jb2.setBackground(Color.GREEN);
        jb3.setBackground(Color.BLUE);
        jb1.setBounds(20,80,80,40);
        jb2.setBounds(120,80,80,40);
        jb3.setBounds(220,80,80,40);
        jb1.addActionListener(new changeColor());
        jb2.addActionListener(new changeColor());
        jb3.addActionListener(new changeColor());
        jp.add(jb1);
        jp.add(jb2);
        jp.add(jb3);
        this.setVisible(true);
    }
    private class changeColor implements ActionListener
    {

        public void actionPerformed(ActionEvent e) {
            if(e.getSource()==jb1)
            {
                r+=10;
                if(r>255)r=0;
                jp.setBackground(new Color(r,g,b));
            }
            if(e.getSource()==jb2)
            {
                g+=10;
                if(g>255)
                    g=0;
                jp.setBackground(new Color(r,g,b));
            }
            if(e.getSource()==jb3)
            {
                b+=10;
                if(b>255)
                    b=0;
                jp.setBackground(new Color(r,g,b));
            }
        }

    }
    public static void main(String[] args) {
        new Test_4();
    }
}

3.设计出如图所示Windows操作系统附带的小应用-计算器样式的简单计算器
1）只需要实现简单的加减乘除功能
2）菜单内容和样式如同系统自带计算器,但功能只需实现退出系统功能

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

import java.awt.event.*;
public class calculateTest {
private JFrame frame;
private JButton button_point,button8,button7,button9,button_div,button4,button5,button6,button_mul,button1,button2,button3,button0,button_equ,button_sub,button_add;
private JTextField textField,textField_1;
StringBuffer str=new StringBuffer();
StringBuffer str1=new StringBuffer();
private int sum;
private int count=0;
private double sum1;
private class change implements ActionListener{
		public void actionPerformed(ActionEvent e)
		{
			
			if(e.getSource()==button0)
			{str.append("0");str1.append("0");textField.setText(str1.toString());}
			if(e.getSource()==button1)
			{str.append("1");str1.append("1");textField.setText(str1.toString());}
			if(e.getSource()==button2)
			{str.append("2");str1.append("2");textField.setText(str1.toString());}
			if(e.getSource()==button3)
			{str.append("3");str1.append("3");textField.setText(str1.toString());}
			if(e.getSource()==button4)
			{str.append("4");str1.append("4");textField.setText(str1.toString());}
			if(e.getSource()==button5)
			{str.append("5");str1.append("5");textField.setText(str1.toString());}
			if(e.getSource()==button6)
			{str.append("6");str1.append("6");textField.setText(str1.toString());}
			if(e.getSource()==button7)
			{str.append("7");str1.append("7");textField.setText(str1.toString());}
			if(e.getSource()==button8)
			{str.append("8");str1.append("8");textField.setText(str1.toString());}
			if(e.getSource()==button9)
			{str.append("9");str1.append("9");textField.setText(str1.toString());}
			if(e.getSource()==button_point)
			{str.append(".");str1.append(".");textField.setText(str1.toString());}
			if(e.getSource()==button_equ)
			{
				String s=str.toString();
				count=0;
				if(s.contains("+"))
				{
					String[] arr=s.split("\\+");
					sum=Integer.parseInt(arr[0])+Integer.parseInt(arr[1]);
					textField_1.setText(sum+"");
					str.delete(0, str.length());
					str1.delete(0, str1.length());
				}
				else if(s.contains("-"))
				{
					String[] arr=s.split("\\-");
					sum=Integer.parseInt(arr[0])-Integer.parseInt(arr[1]);
					textField_1.setText(sum+"");
					str.delete(0, str.length());
					str1.delete(0, str1.length());
				}
				else if(s.contains("*"))
				{
					String[] arr=s.split("\\*");
					sum1=Double.parseDouble(arr[0])*Double.parseDouble(arr[1]);
					textField_1.setText(sum1+"");
					str.delete(0, str.length());
					str1.delete(0, str1.length());
				}
				else if(s.contains("÷"))
				{
					String[] arr=s.split("÷");
					if(arr[1].equals("0"))
					{	textField_1.setText("除数不能为0");str.delete(0, str.length());str1.delete(0, str1.length());}
					else
					{sum1=Double.parseDouble(arr[0])/Double.parseDouble(arr[1]);textField_1.setText(sum1+"");str.delete(0, str.length());str1.delete(0, str1.length());}
					
				}
				else
				{
					textField_1.setText(str.toString());
					str.delete(0, str.length());
					str1.delete(0, str1.length());
				}
				sum=0;
			}
		}
	}
public static void main(String[] args) {
					calculateTest window = new calculateTest();
					window.frame.setVisible(true);
	}
public calculateTest()
	{
	initialize();
	}

	private void initialize() {
		frame = new JFrame();
		frame.setBounds(100, 100, 450, 300);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(323, 405);
		frame.setResizable(false);
		
		frame.getContentPane().setLayout(null);
		
		JMenuBar mb = new JMenuBar();
		mb.setBounds(0, 0, 299, 23);
		frame.getContentPane().add(mb);
		
		JMenu jm1 = new JMenu("查看(V)");
		mb.add(jm1);
		
		JRadioButtonMenuItem jrb1 = new JRadioButtonMenuItem("标准型(T)");

		jm1.add(jrb1);
		
		JRadioButtonMenuItem jrb2 = new JRadioButtonMenuItem("科学型(S)");
		jm1.add(jrb2);
		
		JRadioButtonMenuItem jrb3 = new JRadioButtonMenuItem("程序员(P)");
		jm1.add(jrb3);
		
		JRadioButtonMenuItem jrb4 = new JRadioButtonMenuItem("统计信息(A)");
		jm1.add(jrb4);
		jm1.addSeparator();
		JRadioButtonMenuItem jrb5 = new JRadioButtonMenuItem("历史记录(Y)");
		jm1.add(jrb5);
		
		JRadioButtonMenuItem jrb6 = new JRadioButtonMenuItem("数字分组(I)");
		jm1.add(jrb6);
		jm1.addSeparator();
		JRadioButtonMenuItem jrb7 = new JRadioButtonMenuItem("基本(B)");
		jm1.add(jrb7);
		
		JRadioButtonMenuItem jrb8 = new JRadioButtonMenuItem("单位转换(U)");
		jm1.add(jrb8);
		
		JRadioButtonMenuItem jrb9 = new JRadioButtonMenuItem("日起计算(D)");
		jm1.add(jrb9);
		
		JMenu jm4 = new JMenu("工作表(W)");
		jm1.add(jm4);
		
		JRadioButtonMenuItem jrb10 = new JRadioButtonMenuItem("抵押(M)");
		jm4.add(jrb10);
		
		JRadioButtonMenuItem jrb11 = new JRadioButtonMenuItem("汽车租赁(V)");
		jm4.add(jrb11);
		
		JRadioButtonMenuItem jrb12 = new JRadioButtonMenuItem("油耗(mpg)(F)");
		jm4.add(jrb12);
		
		JRadioButtonMenuItem jrb13 = new JRadioButtonMenuItem("油耗(l/100km)(U)");
		jm4.add(jrb13);
		
		JMenu jm2 = new JMenu("编辑(E)");
		mb.add(jm2);
		
		JMenuItem jmi1 = new JMenuItem("复制(C)");
		jm2.add(jmi1);
		
		JMenuItem jmi2 = new JMenuItem("粘贴(P)");
		jm2.add(jmi2);
		
		JMenu jm5 = new JMenu("历史记录(H)");
		jm2.add(jm5);
		
		JMenuItem jmi3 = new JMenuItem("复制历史记录");
		jm5.add(jmi3);
		
		JMenuItem jmi4 = new JMenuItem("编辑(E)");
		jm5.add(jmi4);
		
		JMenuItem jmi5 = new JMenuItem("取消编辑(N)");
		jm5.add(jmi5);
		
		JMenuItem jmi6 = new JMenuItem("清除(L)");
		jm5.add(jmi6);
		
		JMenu jm3 = new JMenu("帮助(H)");
		mb.add(jm3);
		
		JMenuItem jmi7 = new JMenuItem("查看帮助(V)");
		jm3.add(jmi7);
		
		JMenuItem jmi8 = new JMenuItem("关于计算机(A)");
		jm3.add(jmi8);
		
		JPanel panel = new JPanel();
		panel.setBounds(10, 127, 289, 150);
		frame.getContentPane().add(panel);
		panel.setLayout(new GridLayout(0, 5, 4, 4));
		
		JButton bMC = new JButton("MC");
		panel.add(bMC);
		
		JButton bMR = new JButton("MR");
		panel.add(bMR);
		
		JButton bMS = new JButton("MS");
		panel.add(bMS);
		
		JButton bM1 = new JButton("M+");
		panel.add(bM1);
		
		JButton bM2 = new JButton("M-");
		panel.add(bM2);
		
		JButton b_delete = new JButton("<—");
		panel.add(b_delete);
		
		JButton bCE = new JButton("CE");
		panel.add(bCE);
		
		JButton bC = new JButton("C");
		panel.add(bC);
		
		JButton b_rev = new JButton("±");
		panel.add(b_rev);
		
		JButton b_sqrt = new JButton("√");
		panel.add(b_sqrt);
		
		button7 = new JButton("7");
		panel.add(button7);
		
		button8 = new JButton("8");
		panel.add(button8);
	
		
		button9 = new JButton("9");
		panel.add(button9);
		button_div = new JButton("/");
		panel.add(button_div);
		
		JButton b_mod = new JButton("%");
		panel.add(b_mod);
		
		button4 = new JButton("4");
		panel.add(button4);
		button5 = new JButton("5");
		panel.add(button5);
		button6 = new JButton("6");
		panel.add(button6);
		button_mul = new JButton("*");
		panel.add(button_mul);
		JButton b_back = new JButton("1/x");
		panel.add(b_back);
		
		JPanel panel_1 = new JPanel();
		panel_1.setBounds(9, 281, 288, 75);
		frame.getContentPane().add(panel_1);
		panel_1.setLayout(null);
		
		button1 = new JButton("1");
		button1.setBounds(2, 0, 54, 34);
		panel_1.add(button1);		
		button2 = new JButton("2");
		button2.setBounds(60, 0, 54, 34);
		panel_1.add(button2);
		button3 = new JButton("3");
		button3.setBounds(118, 0, 54, 34);
		panel_1.add(button3);
		button_point = new JButton(".");
		button_point.setBounds(118, 38, 54, 34);
		panel_1.add(button_point);
		
		button0 = new JButton("0");
		button0.setBounds(2, 38, 112, 34);
		panel_1.add(button0);		
		button_equ = new JButton("=");
		button_equ.setBounds(234, 0, 54, 72);
		panel_1.add(button_equ);
		button_equ.addActionListener(new change());
		
		JPanel panel_2 = new JPanel();
		panel_2.setBorder(BorderFactory.createLineBorder(Color.BLACK, 3) );
		panel_2.setForeground(new Color(0, 0, 0));
		panel_2.setBounds(10, 33, 289, 84);
		frame.getContentPane().add(panel_2);
		panel_2.setLayout(null);
		
		textField = new JTextField();
		textField.setHorizontalAlignment(SwingConstants.RIGHT);
		textField.setEditable(false);
		textField.setBounds(10, 10, 269, 31);
		textField.setBorder(new EmptyBorder(0, 0, 0, 0));
		textField.setFont(new Font("宋体",Font.PLAIN,20));
		panel_2.add(textField);
		textField_1 = new JTextField();
		textField_1.setHorizontalAlignment(SwingConstants.RIGHT);
		textField_1.setEditable(false);
		textField_1.setBorder(BorderFactory.createEmptyBorder());
		textField_1.setBounds(10, 38, 269, 36);
		textField_1.setFont(new Font("宋体",Font.PLAIN,20));
		textField_1.setText("0");
		panel_2.add(textField_1);
		bC.addActionListener(new ActionListener() {		
			public void actionPerformed(ActionEvent e) {
				textField.setText("");
				textField_1.setText("0");
				str.delete(0, str.length());
				str1.delete(0, str1.length());
				count=0;
			}
		});
		button_sub = new JButton("-");
		button_sub.setBounds(176, 0, 54, 34);
		panel_1.add(button_sub);
		button_sub.addActionListener(new change());
		button_add = new JButton("+");
		button_add.setBounds(176, 38, 54, 34);
		panel_1.add(button_add);
		button0.addActionListener(new change());
		button1.addActionListener(new change());
		button2.addActionListener(new change());
		button3.addActionListener(new change());
		button4.addActionListener(new change());
		button5.addActionListener(new change());
		button6.addActionListener(new change());
		button7.addActionListener(new change());
		button8.addActionListener(new change());
		button9.addActionListener(new change());
		button_point.addActionListener(new change());
		button_add.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				
				count++;
				str1.append("+");
				textField.setText(str1.toString());
				if(count!=1)
				{
					calculate();
				}
				str.append("+");
			}
		});
		button_sub.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				count++;
				str1.append("-");
				textField.setText(str1.toString());
				if(count!=1)
				{
					calculate();
				}
				str.append("-");
			}
		});
		button_div.addActionListener(new ActionListener() {
			
			public void actionPerformed(ActionEvent arg0)
			{
				count++;
				str1.append("÷");
				textField.setText(str1.toString());
				if(count!=1)
				{
					calculate();
				}
				str.append("÷");
			}
		
		});
		button_mul.addActionListener(new ActionListener() {
			
			public void actionPerformed(ActionEvent arg0)
			{
				count++;
				str1.append("*");
				textField.setText(str1.toString());
				if(count!=1)
				{
					calculate();
				}
				str.append("*");
			}
		
		});
	}
	public void calculate()
	{
		String s=str.toString();

		if(s.contains("+"))
		{
			String[] arr=s.split("\\+");
			sum=Integer.parseInt(arr[0])+Integer.parseInt(arr[1]);
			textField_1.setText(sum+"");
			str.delete(0, str.length());
			str.append(sum+"");
			count=1;
		}
		else if(s.contains("-"))
		{
			String[] arr=s.split("\\-");
			sum=Integer.parseInt(arr[0])-Integer.parseInt(arr[1]);
			textField_1.setText(sum+"");
			str.delete(0, str.length());
			str.append(sum+"");
			count=1;
			
		}
		else if(s.contains("*"))
		{
			String[] arr=s.split("\\*");
			sum1=Double.parseDouble(arr[0])*Double.parseDouble(arr[1]);
			textField_1.setText(sum1+"");
			str.delete(0,str.length());
			str.append(sum1+"");
			count=1;
		}
		else if(s.contains("÷"))
		{
			String[] arr=s.split("÷");
			if(arr[1].equals("0"))
			{	textField_1.setText("除数不能为0");}
			else
			{sum1=Double.parseDouble(arr[0])/Double.parseDouble(arr[1]);textField_1.setText(sum1+"");	
			str.delete(0,str.length());
			str.append(sum1+"");
			count=1;}
			
		}
	}

}