Geo.java

package com.company.Home;

public class Geo {
    public final int storona1;
    public final int storona2;
    public final int storona3;
    public final int storona4;



    public Geo(int storona1, int storona2, int storona3, int storona4) {

        this.storona1 = storona1;
        this.storona2 = storona2;
        this.storona3 = storona3;
        this.storona4 = storona4;

        if (storona1 == storona2 && storona2 == storona3 && storona3 == storona4){
            System.out.println("Это квадрат");
        } else if (storona1 == storona3 && storona2 == storona4){
            System.out.println("Это прячмоугольник");

        } else {
            System.out.println("Просто четырёхугольник" );
        }

        System.out.println("Периметр " + Perimert4());
    }


    public Geo(int storona1, int storona2, int storona3) {

        this.storona1 = storona1;
        this.storona2 = storona2;
        this.storona3 = storona3;

        if (storona1 == storona2 && storona2 == storona3) {
            System.out.println("Правильный триугольник");
        } else if (storona1 == storona2 | storona2 == storona3 || storona3 == storona1) {
            System.out.println("Ровнобедреный триугольник");
        } else {
            System.out.println("Просто триуголтник");
        }
        System.out.println("Периметр " + Perimert3());
        storona4 = 0;
    }
    public int Perimert3(){
        return storona1 + storona2 + storona3;
    }
    public int Perimert4(){
        return storona1 + storona2 + storona3 + storona4;
    }
}

Main.java

package com.company.Home;

public class Main {


    public static void main(String[] args) {
    Geo triangle = new Geo(4, 7, 7);
    }
}