Hello,World

时间:2023-11-28 13:51:02

引用自http://www.cnblogs.com/jbelial/archive/2013/05/08/3067471.html#2676127

题目:

Hello,World
1 public class text {
2 public static void main(String[] args) {
3 if ( 你的代码 )
4 System.out.print("hello ");
5 else
6 System.out.println("world");
7 }
8 }
Hello,World

  能使他打印“hello world” 。

  

  可使用的方法如下:

  (一)使用匿名内部类:

Hello,World
1 public class HelloWorld {
2 public static void main(String... a) {
3 if (new Object(){{System.out.print("Hello,");}} == null) {
4 System.out.print("Hello,");
5 } else {
6 System.out.println("World");
7 }
8 }
9 }
Hello,World

  (二)利用PrintStream的append或format等方法(append处改为format):

Hello,World
1 public class HelloWorld {
2 public static void main(String... a) {
3 if (System.out.append("Hello,") == null) {
4 System.out.print("Hello,");
5 } else {
6 System.out.println("World");
7 }
8 }
9 }
Hello,World

  (三)利用反射调用System.out.print

Hello,World
public class text {
public static void main(String[] args) throws Exception {
if ( System.out.getClass().getMethod("print",String.class).invoke(System.out, "Hello ")!=null)
System.out.print("hello ");
else
System.out.println("world");
}
}
Hello,World

  (四)利用jdk1.5的printf方法

Hello,World
1 public class HelloWorld {
2 public static void main(String... a) throws Exception {
3 if (System.out.printf("Hello,") == null) {
4 System.out.print("Hello,");
5 } else {
6 System.out.println("World");
7 }
8 }
9 }
Hello,World
(五)匿名内部类
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package com.iotest;
public class TestIm {
     
    public static void main(String[] args) {
        if(new Thread(){ 
            
                this.start(); 
            
            @Override 
            public void run() { 
                System.out.print("world");
            
        }.isAlive()){
            System.out.print("hello ");
        }else{
            System.out.println("world");
        }
    }
     
}