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

}

}