JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Java Parameterized Constructor Examples

  • Parameterized constructors are required to pass parameters on creation of objects.
  • If we define only parameterized constructors, then we cannot create an object with default constructor. This is because compiler will not create default constructor. You need to create default constructor explicitly.

Java Parameterized Constructor Sample Code

Code:
package com.myjava.constructors;

public class MyParameterizedConstructor {
    
    private String name;
    
    public MyParameterizedConstructor(String str){
        this.name = str;
        System.out.println("I am inside parameterized constructor.");
        System.out.println("The parameter value is: "+str);
    }
    
    public static void main(String a[]){
        MyParameterizedConstructor mpc = new MyParameterizedConstructor("Madhu Raj");
    }
}

Example Output

I am inside parameterized constructor.
The parameter value is: Madhu Raj

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Knowledge Centre
What is wrapper class?
Everything in java is an object, except primitives. Primitives are int, short, long, boolean, etc. Since they are not objects, they cannot return as objects, and collection of objects. To support this, java provides wrapper classes to move primitives to objects. Some of the wrapper classes are Integer, Long, Boolean, etc.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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