Hello,World

it2025-01-06  37

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

题目:

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 }

  能使他打印“hello world” 。

  

  可使用的方法如下:

  (一)使用匿名内部类:

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 }

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

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 }

  (三)利用反射调用System.out.print 

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"); } }

  (四)利用jdk1.5的printf方法 

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 } (五)匿名内部类 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 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" );          }      }         }

转载于:https://www.cnblogs.com/jym-sunshine/p/4689376.html

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