第一篇java，实现加减乘除与平方运算

public class one {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		A num ;
	    num=new A();
	    num.n =6;
	    num.m =3;
	    num.k =5;
	    System.out.println(num.n+num.m);
	    System.out.println(num.n-num.m);
	    System.out.println(num.n*num.m);
	    System.out.println(num.n/num.m);
	    System.out.println(num.k*num.k);
	}
       
}
class A{
	int n,m,k;
	void jjxc(int s)
	{
		System.out.println(s);
	}
}

嘿嘿，先发一个，虽然比较简单，保持激情，持续努力。加油！！！