j02050506.java

经典java教材《java完美经典》一书中源码的完全收集

import java.lang.*;

class j02050506
{
  public static void main(String para[])
  {
    boolean testB = false;
    int testX = 10;
    System.out.println( "testB?10:2 = " + (testB ? 10 : 2) );  
                         // testB = false ===> 回传 2
    testB = true; 
    System.out.println( testB ? testX * 10 : testX * 100 );
                      // testB=true ===> 回传 testX*10 的值
    if( testB )
      System.out.println( "计算 testX*10 = " + testX * 10 );
    else
      System.out. println( "计算 testX*100 ==> " + testX * 100 );
           
    //=============== ?: 右方操作数可以是对象 ===============
    Boolean BoolObj1 = new Boolean(true);
    Boolean BoolObj2 = new Boolean(false);    
    Boolean getBoolObj = testX>5 ? BoolObj1 : BoolObj2;
    System.out. println( "getBoolObj.booleanValue() = " 
                         + getBoolObj.booleanValue() );                   
  }  
}