java eclipse 实训项目代码

### Java Eclipse 实训项目代码示例

#### 创建并配置Eclipse工程
为了在Eclipse中启动Java实训项目，需先安装好JDK以及Eclipse IDE。打开Eclipse之后，通过`File -> New -> Project...`来新建一个Java Project。

#### 编写复数类作为实例
下面展示了一个简单的复数(Complex Number)处理类的实现方式：

public class Complex {
    private double real;
    private double imaginary;

    public Complex(double r, double i){
        this.real = r;
        this.imaginary = i;
    }

    // 加法操作方法
    public Complex add(Complex other){
        return new Complex(this.real + other.real,
                           this.imaginary + other.imaginary);
    }
    
    // 减法操作方法
    public Complex subtract(Complex other){
        return new Complex(this.real - other.real,
                          this.imaginary - other.imaginary);
    }

    @Override
    public String toString(){
        return "(" + this.real + " + " + this.imaginary +"i)";
    }
}

此段代码定义了两个基本运算——加法和减法，并重写了toString()以便于打印输出[^2]。

#### 测试复数类的功能
可以创建另一个名为TestComplex的测试类来进行验证:

public class TestComplex {

    public static void main(String[] args) {
        Complex c1 = new Complex(3.0, 4.0); // 构造函数初始化
        Complex c2 = new Complex(-1.0, 2.0);

        System.out.println("C1: "+c1.toString());
        System.out.println("C2: "+c2.toString());

        Complex sum = c1.add(c2);
        System.out.println("Sum of C1 and C2 is :"+sum.toString());

        Complex diff = c1.subtract(c2);
        System.out.println("Difference between C1 and C2 is:"+diff.toString());
    }
}

这段程序展示了如何利用之前编写的复数类执行一些基础的操作，比如相加与相减。