YongYu_IT的专栏

import java.util.*; public class WorldCount { public static void main(String[] args) { Map map = new HashMap<String, Integer>(); while (true) { Scanner sc = new Scanner(System.in); System.out.println("plea...

import java.util.ArrayList; import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { /* int[] array = {40, 20, 30, 90, 60, 50, 10}; System.out.println("paixu before"); paixu(array);*/ ...

public class HelloWorld { public static void main(String[] args) { int[] array={40,20,30,90,60,50,10}; System.out.println("paixu before"); paixu(array); } public static void paixu(int[] arr) { int max = 0; for...

package File; import java.io.*; import java.util.ArrayList; import java.util.Arrays; public class FileOutDemo { public static void main(String[] args) throws IOException { ArrayList<String> arr =new ArrayList<String>(); .

package File; import java.io.*; import java.util.ArrayList; import java.util.Arrays; public class FileOutDemo { public static void main(String[] args) throws IOException { String s="中国"; //byte[] bytes = s.getBytes(); //UTF-8 byte[].

package File; import java.io.*; public class FileOutDemo { public static void main(String[] args) throws IOException { /* FileOutputStream fo=null; try { fo = new FileOutputStream("guoqing0308.txt"); fo.write("abcdef".

import sun.reflect.generics.tree.Tree; import java.io.InputStream; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.TreeSet; public class Poker { public static void main(String[] args) { // .

import java.util.ArrayList; import java.util.Collections; public class Poker { public static void main(String[] args) { ArrayList<String> arr =new ArrayList<String>(); ArrayList<String> lqxarr =new ArrayList<Strin.

package CountString; import sun.nio.ch.sctp.SctpNet; import java.util.HashMap; import java.util.Scanner; import java.util.Set; public class CountString { public static void main(String[] args) { Scanner sc = new Scanner(System.in); .

import java.util.*; public class ListItetator { public static void main(String[] args) { ArrayList<String> list = new ArrayList<String>(); list.add(0, "hello"); list.add(1, "world"); list.add(2, "java"); .

package CollectionDemo001; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; public class CollectionDemo002 { public static void main(String[] args) { Collection<String> cc =new ArrayList<String&gt.

public class ExceptionDemo { public static void main(String[] args) { System.out.println("Start"); method(); System.out.println("End"); } public static void method(){ try{ int a [] ={1,2,3}; System.ou.

import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class SimpleDateFormatDemo { public static void main(String[] args) throws ParseException { Date a =new Date(); //SimpleDateFormat sdf.

public class StringBuildDemo { public static void main(String[] args) { StringBuilder sb=new StringBuilder(); sb.append("hello"); String s=sb.toString(); System.out.println(s); StringBuilder sb2 = new StringBu.

import java.util.Arrays; public class StringPaixu { public static void main(String[] args) { String a = "91,27,47,38,50"; String[] b = a.split(","); int[] aa = new int[5]; for (int i = 0; i < b.length; i++) { .

package MaoPao; public class MaoPao { public static void main(String[] args) { int [] arrey= {5,4,3,1,2}; int [] NewArrey =new int [5]; int tmp=0; for(int i=0;i<arrey.length;i++){ for(int j=0;j<arr...

1、static 从属于类，不随对象的不同而变化，可以通过类和对象调用 例如 getName() ,对象不同，结果应该是不同的，所以这个方法不能定义为 static Main 函数是static ，因为是通过类来运行 Main 函数是static，可以调用getName（），因为是通过对象调用的 2、非 static 属于对象，必须通过对象调用 ...

import java.util.Scanner; public class CountString { public static void main(String[] args) { /* Scanner sc = new Scanner(System.in); System.out.println("please shuru: "); String line = sc.nextLine(); char[] ch = line.

import java.sql.SQLOutput; import java.util.ArrayList; import java.util.Scanner; public class StudentManger { public static void main(String[] args) { ArrayList<Student> arrey = new ArrayList<Student>(); Student s = new S.

１、快速生成语句 快速生成ｍａｉｎ（）方法：ｐｓｖｍ　，回车 快速生成输出语句：ｓｏｕｔ　，回车 ２、内容辅助键 Ｃｔｒｌ＋Ａｌｔ＋ｓｐａｃｅ（内容提示，代码补全等）

1、从键盘输入学生信息 2、将学生信息写入到集合中并遍历打印 import java.util.ArrayList; import java.util.Scanner; public class StudentArrey { public static void main(String[] args) { ArrayList<Student> arr =new ArrayList<Student>(); addStudent(arr

1、Scanner 获取控制台输入的内容，并比较大小 import java.util.Scanner; public class ScannelDemo { public static void main(String[] args) { //创建对象 Scanner sc = new Scanner(System.in); System.out.println("shuru1:"); //获取输入值 in.