Java draw rectangle on jpanel

In Java, you create an object by creating an instance of a class or, in other words, instantiating a class. To create a new object, use Java's operator. Here's an example using the operator to create a Rectangle object (Rectangle is a class in the java.awt package).

new Rectangle(0, 0, 100, 200);

The operator requires a single operand--a call to a constructor method. In the previous example, is a call to a constructor for the Rectangle class.

Constructors are special methods provided by every Java class allowing programmers to create and initialize objects of that type.

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The statement shown above initializes the new Rectangle object to be located at the origin (0, 0) with a width of 100 and a height of 200.

Constructors have the same name as the class and, because Java supports method name overloading, a class can have any number of constructors.

Like other overloaded methods, constructors are differentiated from one another by the number and type of their arguments.

For example, the Rectangle class in the java.awt package provides several different constructors, ea

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