idea的强大之处在于此,它包含了很多小插件,我们不需要再次下载相关插件,只需要在idea中小小的设置一下就可以了,真的yyds。

下面是设置方法,我用的是idea2020版本

打开设置File -> Settings->Diagrams,如何如下图:

 选择我们UML图需要的部分,我选择的是成员变量、构造器和方法。

下面以一个代码为例,展示一下UML图

import java.util.Scanner;
import java.util.Date;
public class GeometricObject {
    public String color;
    public boolean filled;
    Date date = new Date();
    public GeometricObject(){
        //无参构造
        String color ="white";
        boolean filled = true;
    }

    public GeometricObject(String color,boolean filled){
        this.color = color;
        this.filled = filled;
    }
    public String getColor(){
        return color;
    }
    public void setColor(String color){
        this.color = color;
    }
    public boolean isFilled(){
        return filled;
    }
    public void setFilled(boolean filled){
        this.filled = filled;
    }
    public String toString(){
        return "创建于"+date.toString()+"\n颜色是"+color+"\n填充方式是"+filled;
    }

}

public class Triangle extends GeometricObject{
    private double side1 ,side2,side3;

    public Triangle(){
        double side1 = 1.0;
        double side2 = 1.0;
        double side3 = 1.0;
    }
    public Triangle(double side1,double side2,double side3,String color){
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
        this.color =color;
    }
    public Triangle(double side1,double side2,double side3,String color,boolean filled){
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
        setColor(color);
        setFilled(filled);
    }
    public double getArea(){
        double s =(side1+side2+side3) /2;
        return Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
    }
    public double getPerimeter(){
        return side1+side2+side3;
    }
    public String toString(){
        return "三角形三边是:side1="+side1+"side2="+side2+"side3"+side3;
    }

}

import java.util.Scanner;
public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入三角形的三个边长");
        double side1 = scanner.nextDouble();
        double side2 = scanner.nextDouble();
        double side3 = scanner.nextDouble();
        System.out.println("请输入颜色");
        String color = scanner.next();
        System.out.println("请输入是否填充true/false");
        boolean filled = scanner.hasNext();
        Triangle t = new Triangle(side1,side2,side3,color,filled);
        System.out.println("三角形的面积是"+t.getArea());
        System.out.println("三角形的周长是"+t.getPerimeter());
        System.out.println("三角形的颜色是"+t.getColor());
        System.out.println("三角形是否填充"+t.isFilled());
    }
}

按照以下操作就可以生成UML图,或者快捷键Ctrl+Alt+Shift+U

以下是生成结果:

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