【Java例题】2.1复数类

1.定义复数类，包括实部和虚部变量、构造方法、 加减乘除方法、求绝对值方法和显示实部、虚部值的方法。 然后编写一个主类，在其主方法中通过定义两个复数对象来 显示每一个复数的实部值、虚部值和绝对值， 显示两个复数加减乘除结果。

package study;

public class demo1 {
    public static void main(String[] args) throws Exception{
        FuSu x=new FuSu(1,2);
        FuSu y=new FuSu(3,4);
        x.showa();
        x.showb();
        x.abs();
        FuSu z1=FuSu.jia(x,y);
        FuSu z2=FuSu.jian(x,y);
        FuSu z3=FuSu.cheng(x,y);
        FuSu z4=FuSu.chu(x,y);
        System.out.println("jia:"+z1.a+"+"+z1.b+"i");
        System.out.println("jia:"+z2.a+"+"+z2.b+"i");
        System.out.println("jia:"+z3.a+"+"+z3.b+"i");
        System.out.println("jia:"+z4.a+"+"+z4.b+"i");
    }
}

class FuSu{
    protected int a;
    protected int b;
    public FuSu(int a,int b){
        this.a=a;
        this.b=b;
    }
    public static FuSu jia(FuSu x1,FuSu x2){
        int a=x1.a+x2.a;
        int b=x1.b+x2.b;
        return new FuSu(a,b) ;
    }
    public static FuSu jian(FuSu x1,FuSu x2){
        int a=x1.a-x2.a;
        int b=x1.b-x2.b;
        return new FuSu(a,b) ;
    }
    public static FuSu cheng(FuSu x1,FuSu x2){
        int a=x1.a*x2.a-x1.b*x2.b;
        int b=x1.a*x2.b+x1.b*x2.a;
        return new FuSu(a,b);
    }
    public static FuSu chu(FuSu x1,FuSu x2) throws Exception{
        if(x2.a==0){
            throw new Exception("fusu2.a=0");
        }
        if(x2.b==0){
            throw new Exception("fusu2.b=0");
        }
        int a=(x1.a*x2.a+x1.b*x2.b)/(x2.a*x2.a+x2.b*x2.b);
        int b=(x1.b*x2.a-x1.a*x2.b)/(x2.a*x2.a+x2.b*x2.b);
        return new FuSu(a,b);
    }
    public void showa(){
        System.out.println(this.a);
    }
    public void showb(){
        System.out.println(this.b);
    }
    public void abs(){
        double x=Math.sqrt(this.a*this.a+this.b*this.b);
        System.out.println(x);
    }