Rectangle task.

src/Main.java

@@ -0,0 +1,8 @@
+public class Main {
+    public static void main(String[] args) {
+        Rectangle rect = new Rectangle();
+        rect.square();
+        rect.perimeter();
+        rect.announce();
+    }
+}

src/Rectangle.java

@@ -0,0 +1,25 @@
+public class Rectangle {
+    int length;
+    int width;
+
+    Rectangle(int length, int width){
+        this.length = length;
+        this.width = width;
+    }
+
+    Rectangle() {
+        this.length = 5;
+        this.width = 5;
+    }
+
+    int  square(){
+        return length * width;
+    }
+
+    int perimeter(){
+        return (length + width) * 2;
+    }
+    void announce(){
+        System.out.println("Площа прямокутника = " + square() + "\nПериметр прямокутника = " + perimeter());
+    }
+}