Method with Parameters

A parameterized method can operate on a variety of data.

The new Rectangle class has a new method which accepts the dimensions of a rectangle and sets the dimensions with the passed-in value.

 
class Rectangle {
  double width;
  double height;

  double area() {
    return width * height;
  }

  void setDim(double w, double h) { // Method with parameters
    width = w;
    height = h;
  }
}

public class Main {

  public static void main(String args[]) {
    Rectangle mybox1 = new Rectangle();
    double vol;
    mybox1.setDim(10, 20);

    vol = mybox1.area();
    System.out.println("Area is " + vol);

  }
}

The output:


Area is 200.0

Using Objects as Parameters

The following code passes objects to methods.

  

class Test {
  int a;

  Test(int i) {
    a = i;
  }
  boolean equals(Test o) {
    if (o.a == a )
      return true;
    else
      return false;
  }
}

public class Main {
  public static void main(String args[]) {
    Test ob1 = new Test(100);
    Test ob2 = new Test(100);

    System.out.println("ob1 == ob2: " + ob1.equals(ob2));

  }
}

This program generates the following output:


ob1 == ob2: true

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