不学习，永远发现不了自己的潜力

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package listtest;import java.util.ArrayList;import java.util.List;public class RepTest { public static void main(String[] args) { List myList = new ArrayList(); myList.add(0, "java"); myList.add(1, "c++"); myList.ad

package exceltest;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.ss.usermodel.CellType;

package exceltest;import java.util.Scanner;public class TryTest { public static void main(String[] args) { //先输入一个数字或者汉字 //判断不是整数 Scanner scanner = new Scanner(System.in); int num1 = 0; while (true) {

package enumtest;public class Cut { public static void main(String[] args) { Color color1 = Color.ORANGE; switch (color1){ case RED: System.out.println("匹配到红色"); color1.show();

package classtest;public class Cut { public static void main(String[] args) { Cup cup = new Cup(); cup.Eat(); Cup.Family cup1 = new Cup.Family(); cup1.Father(); }}class Cup { private static String name = "小李

package classtest;import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;public class Cut { public static void main(String[] args) { Cup cup = new Cup(); cup.Eat(); }}class Cup { private String name = "小李"; private

package classtest;public class Cut { public static void main(String[] args) { Cup cup = new Cup(); cup.Cost(); }}class Cup{ private String name="小李"; private int age= 34; private void Eat(){ System.out.printl

package classtest;public class Zombies { public static void main(String[] args) { W w = new W(); w.Star(); }}class W { private int age=15; String name= "小王"; private void DD() { System.out.println("外部类输出");

package interfacetest;public class CALL { public static void main(String[] args) { Study study = new Study();// UU u = new UU();// study.Apple(u); study.Apple(new Bell() { @Override public void

public class BankTest { public static void main(String[] args) { CheckingAccount c = new CheckingAccount(); c.setBalance(800); System.out.println("存款后余额="+c.deposit(900)); CheckingAccount d = new CheckingAccount();

package test;public class test01 { public static void main(String[] args) { Person[] p = new Person[3]; p[0] = new Person("张三", 19, "学生"); p[1] = new Person("李四", 13, "学生"); p[2] = new Person("王五", 10, "学生"); f

父类package polyarr;public class Employee { private String name; private double salary; public Employee(String name, double salary) { this.name = name; this.salary = salary; } public String getName() { return

父类public class person { private String name; private int age; public person(String name, int age) { this.name = name; this.age = age; } public String getName() { return name; } public void setName(Str

父类public class person { private String name; private int age; public person(String name, int age) { this.name = name; this.age = age; } public String getName() { return name; } public void setName(Str

父类public class B { public void cal(){ System.out.println("B类cal方法"); }}子类public class A extends B{ public void cal(){ System.out.println("A类cal方法"); } public void info(){// cal();//调用父类的方法// this.ca

public class Text { public static void main(String[] args) { C c = new C(); } static class A{ public A() { System.out.println("A的无参构造器"); } } static class B extends A{ public B() {

public class ExtendsExcersize { public static void main(String[] args) { B b = new B(); } static class A{ public A() { System.out.println("a");//A的无参构造器 } public A(String name) { System.o

Acount封装类public class Acount { public String name; public double money; public String password; public String getName() { return name; } public void setName(String name) { int len = name.length(); if (len=

public static void main(String[] args) { person p = new person("张三", 78); p.info(); } static class person { int age; String name; public person(String name, int age) { this.name =

public static void main(String[] args) { person p = new person(); int res = p.age; System.out.println(res); person p1 = new person("小王",15); System.out.println("姓名是"+p1.name+"年龄是"+p1.age); } static class pers

public static void main(String[] args) { HspMethod method = new HspMethod(); method.showscore("王",0,0,9,54); } static class HspMethod{ public String showscore(String name,double... score){ double res = 0; ...

数组方式public static void main(String[] args) { test a = new test(); int[] arr = a.build(new int[6]); System.out.print(Arrays.toString(arr)); } static class test{ public int[] build(int[] t){ for (int i =

public static void main(String[] args){ Person p = new Person(); p.test(6); } static class Person { String name; int age; String hobby; public void test(int n){//定义一个形参n来接收值 int sum = 0;

int[] arr = new int[10]; boolean shuchu = false; //随机生成1-100之间的10个数保存到数组 for (int i = 0; i < 10; i++) { int a = (int) (Math.random() * 100); arr[i] = a; System.out.print(arr[i]+" "); ...

int[] arr = {10, 15, 45, 50}; int[] newArr = new int[arr.length + 1]; int target = 23; int index = -1; for (int i = 0; i < arr.length; i++) { if (arr[i] <= target) { newArr[i] = arr[i]; .

int[][] arr = new int[10][]; for (int i = 0; i < arr.length; i++) { arr[i] = new int[i + 1];//定义数组中元素个数 for (int j = 0; j < arr[i].length; j++) { if (j == 0 | j == arr[i].length - 1) { ...

//定义一个二维数组，但是只定义了其中一维数组的个数，没有定义一维数组中元素的个数 int[][] arr = new int[3][]; for (int i = 0; i < arr.length; i++) { arr[i] = new int[i+1]; for (int j = 0; j < arr[i].length; j++) { arr[i][j] = ...

//第一种方法 int[] arr1 = {11,22,33,44,55,66}; int[] arr2 = new int[arr1.length]; for (int i = 0; i < arr1.length; i++) { arr2[i] = arr1[arr1.length-1-i]; } System.out.println(Arrays.toString(arr1))...

int[] arr = {4, -1, 9, 10, 23}; for (int i = 0; i < arr.length - 1; i++) { for (int j = 0; j < arr.length - 1 - i; j++) { if (arr[j + 1] < arr[j]) { int temp = arr[j]; arr

char[] arr = new char[26]; for (int i = 0; i < arr.length; i++) { arr[i] = (char) ('A'+i); System.out.print(arr[i]+" "); }

int sum = 0; for (int i = 1; i <=100 ; i++) {// sum+=i; for (int j = 1; j <=i ; j++) { sum+=j; } } System.out.println(sum);输出结果：171700

int count = 0; for (int i = 0; i <= 100; i++) { if (i % 5 != 0) { System.out.print("i=" + i + " " + "\t"); count++; if (count % 5 == 0) { System.out.println(...

double money = 100000; double count = 0;//经过路口的次数 double count1 = 0; double count2 = 0; for (count = 0; count <= 100; count++) { while (money > 50000) { System.out.println("交" + (money*0.05)

Scanner scanner = new Scanner(System.in); System.out.println("请输入一个整数"); int b = scanner.nextInt(); //百位 System.out.println(b/100); //十位 System.out.println((b-(b/100)*100)/10); //个位 Sy...

public static void main(String[] args) { for (int i = 1; i < 4; i++) { if (i==3){ System.out.println("小王是猪"); return; } System.out.println("小王是狗"); } System.out.

label1: for (int i = 0; i < 4; i++) { label2: for (int j = 0; j <10 ; j++) { if (j==2){// continue ;// continue label2; continue label1; .

//Created By ybbScanner scanner = new Scanner(System.in); int chance = 3; for (int i = 1; i <=chance; i++) { System.out.println("请输入用户名"); String name = scanner.next(); System.out.println("请输入密码");

public static void main(String[] args) { int count = 0; for (int i = 0; i <=100; i++) {//循环次数控制 int a = (int) (Math.random() * 100); System.out.println("a="+a); count++; if ( a == 97) {

public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int totallevel = scanner.nextInt(); for (int k = 1; k <= totallevel; k++) {//行数 for (int j =0; j <totallexve-k; j++) {//空格数