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();
}
}
回圈
while(true){
//do something
}
do{
//這里先執行一次
}while(ex)
for（int i =1;i<=100;i++ ）{
//回圈體
}
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();
}
}
增強for回圈
回圈陣列
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不執行回圈剩余的陳述句
- continue跳出當前回圈后，下一次回圈會繼續，用來終止某一次的回圈
列印三角形
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();
}
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