在构造函数中使用方法 [英] Using methods inside a constructor

问题描述

我刚开始学习Java，并试图理解OOP，但是我似乎找不到任何人遇到同样的问题.我的问题是，可以在构造函数内使用方法，例如此处的示例:

I'm new to learning Java and was trying to understand OOP, but I can't seem to find anyone who has the same exact question. My question is, is it okay to use methods inside a constructor like the example here:

package ezrab.nl;

public class Calculations {

    private int number;
    private int multiplier;

    private String operator = "";

    public Calculations(int number, String operator, int multiplier) {
        this.number = number;
        this.operator = operator;
        this.multiplier = multiplier;
        switch (getOperator()) {
        case "+":
            System.out.println(getNumber() + getMultiplier());
            break;
        case "-":
            System.out.println(getNumber() - getMultiplier());
            break;
        case "*":
            System.out.println(getNumber() * getMultiplier());
            break;
        case "/":
            System.out.println(getNumber() / getMultiplier());
            break;
        case "%":
            System.out.println(getNumber() % getMultiplier());
            break;
        default:
            System.out.println("Something went wrong.");
        }
    }

    public int getNumber() {
        return this.number;
    }

    public void setNumber(int number) {
        this.number = number;
    }

    public int getMultiplier() {
        return this.multiplier;
    }

    public void setMultiplier(int multiplier) {
        this.multiplier = multiplier;
    }

    public String getOperator() {
        return this.operator;
    }

    public void setOperator(String operator) {
        this.operator = operator;
    }

}

所以我想知道，是否允许使用我在构造函数中创建的方法.

So I'd like to know, is it allowed to use the methods I've created inside the constructor.

编辑:我想指出该程序正在运行.我只想知道我是否遵循规则正确地进行面向对象操作.

I'd like to point out that the program is working. I just want to know if I followed the rules to OOP correctly.

推荐答案

将对象的行为与创建分开放置:

Put behavior of object separately with creation:

public class Calculations {

private int number;
private int multiplier;
private String operator = "";

public Calculations(int number, String operator, int multiplier) {
    this.number = number;
    this.operator = operator;
    this.multiplier = multiplier;
}

public int getNumber() {
    return this.number;
}

public void setNumber(int number) {
    this.number = number;
}

public int getMultiplier() {
    return this.multiplier;
}

public void setMultiplier(int multiplier) {
    this.multiplier = multiplier;
}

public String getOperator() {
    return this.operator;
}

public void setOperator(String operator) {
    this.operator = operator;
}

public void print() {
     switch (getOperator()) {
    case "+":
        System.out.println(getNumber() + getMultiplier());
        break;
    case "-":
        System.out.println(getNumber() - getMultiplier());
        break;
    case "*":
        System.out.println(getNumber() * getMultiplier());
        break;
    case "/":
        System.out.println(getNumber() / getMultiplier());
        break;
    case "%":
        System.out.println(getNumber() % getMultiplier());
        break;
    default:
        System.out.println("Something went wrong.");
    }
}
}

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