java - 在Java中实例化一个对象的多个实例

Question

我正在尝试使用 Java 编写一个简单的加法程序，我想知道是否可以使一个对象的多个实例工作:

public class test {
    class Number { 
        public Number(double d, double e) {
    }
    public double number1;
    public double number2;
}

Number numSet1 = new Number(15.0, 30.0);
Number numSet2 = new Number(20.0, 30.0);

private void setNum(double n1, double n2) {
    number1 = n1;
    number2 = n2;
}

private static double getSum(double n1, double n2) {
    return number1 + number2;
}

我希望输出是这样的:45.050.0分别。

不知道我做错了什么。

Answer 1

考虑

public class test {
    class Number { 
        public Number(double d, double e) {
          number1 = d;
          number2 = e;
    }
    public double number1;
    public double number2;
}

private void setNum(double n1, double n2) {
    number1 = n1;
    number2 = n2;
}

private double getSum() {
    return number1 + number2;
}

//测试来自 main 的调用？

Number numSet1 = new Number(15.0, 30.0);
Number numSet2 = new Number(20.0, 30.0);

result = numSet1.getSum ();