java学习初体验之课后习题

import java.util.Scanner;

public class HelloWorld {

public static void main(String[] args) {

//打印Hello World；
System.out.println("HelloWorld");
//用for循环打印10遍Hello World；
for(int i=0;i<10;i++){
System.out.println("HelloWorld");
}

//用while循环将Hello World以单个字符的形式打印；
String str="Hello World";
char[] ch = str.toCharArray();
int i=0;
while (i<ch.length){
System.out.print(ch[i]+" ");
i++;
}

//将Hello World以倒序打印；
String str1="Hello World";
char[] ch1 = str1.toCharArray();
int number=ch1.length-1;
while (number>=0){
System.out.print(ch1[number]+" ");
number--;
}

//在控制台输入任意内容，当内容里包含”我是宝宝“时打印Hello World；
Scanner input=new Scanner(System.in);
String str2=input.next();
String a="我是宝宝";
if(str2.contains(a)){
System.out.println("Hello World");
}

//打印数组helloWorld，String[] helloWorld = {"h","e","l","l","o","r"," ","w","o","r","l","d"};
String[] list={"h","e","l","l","o","r"," ","w","o","r","l","d"};
for(String element: list){
System.out.print(element);
}

}

}