1.把数字格式化为货币字符串：

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Scanner;
public class FormatNumber {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);// 创建标注输入流扫描器
        System.out.println("请输入一个数字：");
        double number = scan.nextDouble();// 获取用户输入数字
        System.out.println("该数字用Locale类的以下常量作为格式化对象的构造参数，将获得不同的货币格式：");
        // 创建格式化对象
        NumberFormat format = NumberFormat.getCurrencyInstance(Locale.CHINA);
        // 输出格式化货币格式
        System.out.println("Locale.CHINA：" + format.format(number));
        format = NumberFormat.getCurrencyInstance(Locale.US);
        System.out.println("Locale.US：" + format.format(number));
        format = NumberFormat.getCurrencyInstance(Locale.ENGLISH);
        System.out.println("Locale.ENGLISH：" + format.format(number));
        format = NumberFormat.getCurrencyInstance(Locale.TAIWAN);
        System.out.println("Locale.TAIWAN：" + format.format(number));
    }
}


2.格式化日期

package com.lixiyu;
import java.util.Date;
public class Year {
public static void main(String[] args){
    Date date=new Date();
    String year=String.format("%tY",date);
    String month=String.format("%tB",date);
    String day=String.format("%td",date);
    System.out.println("今年是："+year+"年");
    System.out.println("现在是："+month);
    System.out.println("今天是："+day+"号");
}
}