13.java MessageFormat 类

package com.randomOfPackage;

import java.text.MessageFormat;
import java.util.Scanner;

public class MessageClass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
//		MessageFormat messageFormat=new MessageFormat(null);
		//占位符
		//拼装字符串
		String str=MessageFormat.format("select *from stuData where stuNo={0} and password={1}", "100927","abc123");
        System.out.println(str);//select *from stuData where stuNo=100,927 and password=abc123
        
       //从键盘接收用户名、密码
        Scanner input=new Scanner(System.in);
        System.out.println("请输入用户名"); 
        String name=input.next();
        System.out.println("请输入密码:");
        String password =input.next();
        String sqlStr=MessageFormat.format("select *from stuData where stuNo={0} and password={1}", name,password);
        if (str.equals(sqlStr)) {
        	 System.out.println("SQL语句:"+sqlStr);
		} else {
			System.out.println("ERROR");

		}
        //格式化 
        String strSQL=String.format("select *from %s where userName='%s'", name,password);
        System.out.println(strSQL);
        
        //NumberFormat 类 在包java。util 下
        
        
	}

}

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