for循环

public class WriteSquares{

       public static void main(String[] args){

             System.out.println(1+" squared = "+(1*1));

             System.out.println(2+" squared = "+(2*2));

             System.out.println(3+" squared = "+(3*3));

             System.out.println(4+" squared = "+(4*4));

             System.out.println(5+" squared = "+(5*5));

        }
} 

不用for循环程序显得太复杂了，简化后

public class WriteSquares2{

        public static void main(String[] args){

               for(int i=1;i<=5;i++){

                     System.out.println(i + " squared = "+ (i * i));

              }
        }

}