JavaSE 第六讲 Flow Control Statement 9.25

1、条件运算符
type d = a ? b : c 如int d = 2 < 1 ? 3 : 4;

2、流程控制语句if用法

public class IfTest
    {
               public static void main(String[] args)
           {
                     int a = 2;
                 int b = 2;

                /*
            if(a < b) 
            //if(a > b)
                {
                System.out.println("executed!");
                }
                */

        /*
            if(a > b) 
            {
                System.out.println("a > b");
        }
        else
        {
                System.out.println("a <= b");
        }
        */

        if(a > b)
        {
               System.out.println("a > b");
        }
                else if(a < b)
        {
               System.out.println("a < b");           
        }
        else
        {
              System.out.println("a == b");
        }

    }
}

3.Switch语句

public class SwitchTest
{
        public static void main(String[] args)
   {
           int a = 3;

          /*
         switch(a)
         {
           case 1:
               System.out.println("a == 1");
               break;
           case 2:
               System.out.println("a == 2");
               break;
           case 3:
                           System.out.println("a == 3");
               //break;
           default:
               System.out.println("default");
           }
                 */

    if(a == 1)
    {
            System.out.println("a == 1");
    }
            else if(a == 2)
    {
            System.out.println("a == 2");
    }       
    else if(a == 3)
    {
            System.out.println("a == 3");
    }
    else
    {
            System.out.println("default");
    }
}
}