浅析Java常用API(Scanner，Random)匿名对象

import java.util.scanner;

//从键盘输入三个数，输出最大值

public class scannerdemo {

   public static void main(string[] args) {

     scanner s= new scanner(system.in);

     int num=s.nextint();

     system.out.println(num);

     string str=s.next();

     system.out.println(str);

     int a=s.nextint();

     int b=s.nextint();

     int c=s.nextint();

     int max=a>b?a:b;

     int endmax=c>max?c:max;

     system.out.println(endmax);

   }

}

import java.util.random;

import java.util.scanner;

//猜随机数，只有五次机会

public class demorandom {

   public static void main(string[] args) {

     random r= new random();

     scanner s= new scanner(system.in);

     int res=r.nextint( 100 ); //[0,100)

     system.out.println(res);

     int i= 0 ;

     while (i< 5 ){

       system.out.println( "请输入猜的数字，我们帮你判断" );

       int num=s.nextint();

       if (num>res){

         system.out.println( "大了哦" );

         i++;

         continue ;}

       else if (num<res){

         system.out.println( "小了" );

         i++;

         continue ;

       }

       else {

         system.out.println( "猜对了" );

         i++;

         break ;

       }

     }

     if (i== 5 )

       system.out.println( "你的次数用完了" );

     else

       system.out.println( "恭喜，你用了" +i+ "次" );

   }

}

import java.util.scanner;

/*匿名对象作形参，返回值

*/

public class demoanonymous {

   public static void main(string[] args) {

     meth( new scanner(system.in));

     scanner s=meth2();

     int num=s.nextint();

     system.out.println(num);

   }

   public static void meth(scanner sc){

     int num=sc.nextint();

     system.out.println(num);

   }

   public static scanner meth2(){

     return new scanner(system.in);

   }

}