jiege_aixuexi的博客

JDK7流对象自动释放public class Liu { public static void main(String[] args) {//对象创建放在try(流对象){} try(FileReader fr=new FileReader("Demo.iml"); FileWriter fw=new FileWriter("De.txt"); ){ int len=0; char[] c.

package demo6;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.Scanner;public class ZhonJi { public static void main(String[] args) throws ParseException { ...

import java.util.ArrayList;import java.util.Collections;import java.util.HashMap;import java.util.TreeMap;import java.util.TreeSet;public class XiPaiG { public static void main(String[] args) { //创建HashMap集合将Integer类型作为键将String类型作为值 ...

import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;public class XiPai { public static void main(String[] args) { ArrayList<String> arr=new ArrayList<String>(); //分别创建花色的集合和数字的集合 ...

//Student类package Map_jihe;public class Student { private String name; private int age; public Student() { } public Student(String name, int age) { this.name = name; this.age = age; }...

package Map_jihe;import java.util.*;public class Ci { public static void main(String[] args) { //键盘输入 Scanner a=new Scanner(System.in); //键盘输入字符串 String a1=a.nextLine(); //关闭键盘输入 a.close(); //...