java创建默认矩形的无参构造方法

2025-03-16 04:50:37
推荐回答(5个)
回答1:

public class Rectangle{
public Rectangle() {
//这个就表示无参的构造方法, 在你不写这个构造方法时, 创建对象 时,编译器会编译默认添加无参构造方法
}
public static void main(String[] args) {
Rectangle re =new Rectangle();
}
}

回答2:

public class Rectangle {

public float length; // 矩形长度
public float width; // 矩形宽度

public Rectangle() {
// 在无参构造方法中给长宽赋值
this.length = 5;
this.width = 10;
}
}

长宽的默认值需要你自己设置 , 我只是举例使用了5 , 10 .

回答3:

public class Rectangle {
    private int length;
    private int width;

    public Rectangle() {
        this.length=10;
        this.width=5;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }
}

在无参数的默认构造方法中可以初始化一个默认的长和宽,可以根据自己的需求设定

回答4:

没有参数的构造方法就是无参构造方法,假如你的矩形类叫Rectangle



public class Rectangle {
    // 无参构造方法
    public Rectangle() {
    }
}

回答5:

默认无参,和自己写的无参是一样的,但是你写了一个非无参数的构造方法,如果需要无参数构造方法,必须自己写
默认的构造方法,就是无参构造方法
public Object(){

}

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