scanner
package com.jun.scanner;import java.util.Scanner;public class Demo01 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("使用next方式接收"); if(scanner.hasNext()){ String str = scanner.next(); System.out.println(str); } scanner.close(); }}
循环
while(true){ //do something}do{ //这里先执行一次 }while(ex)for(int i =1;i<=100;i++ ){ //循环体}
99乘法表
public static void main(String[] args) { for (int j = 1; j <= 9; j++) { for (int i = 1; i <= j; i++) { System.out.print(j+"*"+i+"="+j*i+"\t"); } System.out.println(); } }
增强for循环
循环数组
public static void main(String[] args) { int [] numbers = {10,20,30,40,50}; for(int i:numbers){ System.out.println(i); } }
break 和 continue
- break不执行循环剩余的语句
- continue跳出当前循环后,下一次循环会继续,用来终止某一次的循环
打印三角形
for (int i = 1; i <= 5; i++) { for (int j = 5; j >=i; j--) { System.out.print(" "); } for (int j = 1; j <= i; j++) { System.out.print("*"); } for (int j = 1; j < i; j++) { System.out.print("*"); } System.out.println(); }
原文转载:http://www.shaoqun.com/a/540596.html
敦煌网站:https://www.ikjzd.com/w/189
patpat:https://www.ikjzd.com/w/1079
scannerpackagecom.jun.scanner;importjava.util.Scanner;publicclassDemo01{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);System.out.println("使用next方式接收");if(scanner.ha
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