Java-toString练习

声明并测试一个复数类，其方法包括toString（）及复数的加、减、乘运算。

#代码自留

package exp2;

import java.util.Scanner;

class Complex {
	
	private int a;
	private int b;
	
	public Complex(int a, int b) {
		this.a = a;
		this.b = b;
	}

	public int getA() {
		return a;
	}

	public void setA(int a) {
		this.a = a;
	}

	public int getB() {
		return b;
	}

	public void setB(int b) {
		this.b = b;
	}
	
	public String toString() {
		return (a + " + " + b + "i");
	}
	
	public Complex Add(Complex t) {
		return new Complex(this.a + t.getA(), this.b + t.getB());
	}
	
	public Complex Sub(Complex t) {
		return new Complex(this.a - t.getA(), this.b - t.getB());
	}
	
	public Complex Mul(Complex t) {
		int a1 = this.a * t.getA() - this.b * t.getB();
		int b1 = this.a * t.getB() + this.b * t.getA();
		return new Complex(a1, b1);
	}
	
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner = new Scanner(System.in);
		Complex c1 = new Complex(scanner.nextInt(), scanner.nextInt());
		Complex c2 = new Complex(scanner.nextInt(), scanner.nextInt());
		
		System.out.println("a + b = " + c1.Add(c2).toString());
		System.out.println("a - b = " + c1.Sub(c2).toString());
		System.out.println("a * b = " + c1.Mul(c2).toString());
		
		scanner.close();
	}
}