参考一 java仿win7计算器布局
参考二 Swing布局管理器介绍
参考三hw1287789687 大侠的帖子回复
再结合网上各路神人及之前写的博客Swing编程方面步骤,如下:
package calPack;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame{//自定义类文件,必须继承JFrame框架
//定义组件
JMenuBar jmb;
JMenu[] jm;
JMenuItem[] jmi;
JTextField jtf;
JButton[] jb;
public static void main(String[] args)// 添加主函数,并调用类的构造函数
{
new Calculator();
}
public Calculator()//添加构造函数
{
//创建组件
jmb = new JMenuBar();
jm = new JMenu[3];
jm[0] = new JMenu("查看(V)");
jm[1] = new JMenu("编辑(E)");
jm[2] = new JMenu("帮助(H)");
jmi = new JMenuItem[4];
jmi[0] = new JMenuItem("标准型(T)");
jmi[1] = new JMenuItem("复制(C)");
jmi[2] = new JMenuItem("粘贴(P)");
jmi[3] = new JMenuItem("关于(A)");
jtf = new JTextField("0");
jb = new JButton[28];
jb[0] = new JButton("MC");
jb[1] = new JButton("MR");
jb[2] = new JButton("MS");
jb[3] = new JButton("M+");
jb[4] = new JButton("M-");
jb[5] = new JButton("Backspace");
jb[6] = new JButton("CE");
jb[7] = new JButton("C");
jb[8] = new JButton("+/-");
jb[9] = new JButton("sqrt");
jb[10] = new JButton("7");
jb[11] = new JButton("8");
jb[12] = new JButton("9");
jb[13] = new JButton("/");
jb[14] = new JButton("%");
jb[15] = new JButton("4");
jb[16] = new JButton("5");
jb[17] = new JButton("6");
jb[18] = new JButton("*");
jb[19] = new JButton("1/x");
jb[20] = new JButton("1");
jb[21] = new JButton("2");
jb[22] = new JButton("3");
jb[23] = new JButton("-");
jb[24] = new JButton("=");
jb[25] = new JButton("0");
jb[26] = new JButton(".");
jb[27] = new JButton("+");
initGUI();//设置布局,添加组件
//设置窗口属性
this.setTitle("使用java制作的简易计算器By毛二");//基础属性
this.setIconImage(new ImageIcon("熊猫.jpg").getImage());//设置窗口标题
this.setSize(400,250);//设置大小,按像素
this.setLocation(200,200);//设置初始位置,默认是屏幕最左上角
this.setVisible(true);//让它显示,位置可变
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置默认到关闭操作,不然java虚拟机还没也关闭
}
//设置布局。
private void initGUI() {
this.setJMenuBar(jmb);
jmb.add(jm[0]);
jmb.add(jm[1]);
jmb.add(jm[2]);
jm[0].add(jmi[0]);
jm[1].add(jmi[1]);
jm[1].add(jmi[2]);
jm[2].add(jmi[3]);
jtf.setEditable(false);//文本框不可编辑
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setLayout(gridbag);
c.weightx = 0.01;//容器上的计算器各个部件成一个布局,这个参数,可以把容器和窗体合二为一,不会出现窗体过大而容器还留有空隙
c.weighty = 0.01;
c.fill = GridBagConstraints.BOTH;
//文本框
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 5;
c.gridheight = 2;
add(jtf,c);
//MC
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 1; // 横占一个单元格
c.gridheight = 1; // 列占一个单元格
addButton(jb[0],gridbag,c);//添加按钮到面板布局
//MR
c.gridx = 1; //换行,放置组件,只需要修改行的参数就行,其他参数暂时不变。
addButton(jb[1],gridbag,c);
//MS
c.gridx = 2;
addButton(jb[2],gridbag,c);
//M+
c.gridx = 3;
addButton(jb[3],gridbag,c);
//M-
c.gridx = 4;
addButton(jb[4],gridbag,c);
//Backspace
c.gridx = 0;
c.gridy = 3;
addButton(jb[5],gridbag,c);
//CE
c.gridx = 1;
addButton(jb[6],gridbag,c);
//C
c.gridx = 2;
addButton(jb[7],gridbag,c);
//+/-
c.gridx = 3;
addButton(jb[8],gridbag,c);
//Sqrt
c.gridx = 4;
addButton(jb[9],gridbag,c);
//7
c.gridx = 0;
c.gridy = 4;
addButton(jb[10],gridbag,c);
//8
c.gridx = 1;
addButton(jb[11],gridbag,c);
//9
c.gridx = 2;
addButton(jb[12],gridbag,c);
///
c.gridx = 3;
addButton(jb[13],gridbag,c);
//%
c.gridx = 4;
addButton(jb[14],gridbag,c);
//4
c.gridx = 0;
c.gridy = 5;
addButton(jb[15],gridbag,c);
//5
c.gridx = 1;
addButton(jb[16],gridbag,c);
//6
c.gridx = 2;
addButton(jb[17],gridbag,c);
//*
c.gridx = 3;
addButton(jb[18],gridbag,c);
//1/x
c.gridx = 4;
addButton(jb[19],gridbag,c);
//1
c.gridx = 0;
c.gridy = 6;
addButton(jb[20],gridbag,c);
//2
c.gridx = 1;
addButton(jb[21],gridbag,c);
//3
c.gridx = 2;
addButton(jb[22],gridbag,c);
//-
c.gridx = 3;
addButton(jb[23],gridbag,c);
//=
c.gridx = 4;
c.gridy = 6;
c.gridheight = 2; //重新设置列,列占二个单元格
addButton(jb[24],gridbag,c);
//0
c.gridx = 0;
c.gridy = 7;
c.gridwidth = 2; // 重新设置横,横占二个单元格
c.gridheight = 1; // 恢复列,列占一个单元格
addButton(jb[25],gridbag,c);
//.
c.gridx = 2;
c.gridwidth = 1; // 恢复横,横占一个单元格
addButton(jb[26],gridbag,c);
//+
c.gridx = 3;
addButton(jb[27],gridbag,c);
}
//添加按钮到面板布局
private void addButton(JButton jButton, GridBagLayout gridbag,
GridBagConstraints c) {
gridbag.setConstraints(jButton, c);
add(jButton);
}
}