JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to override toString() method with enum?


Description:

This example gives how to override toString() method with enum constants. By default the enum toString() method returns the constant name itself. You can change return value by overriding toString() method.


Code:
package com.java2novice.enums;

public class MyEnumtoString {

	enum Fruit {
	    GRAPE{
	    	public String toString(){
	    		return "A grape is a non-climacteric fruit.";
	    	}
	    }, 
	    APPLE{
	    	public String toString(){
	    		return "The apple is the pomaceous fruit.";
	    	}
	    }, 
	    MANGO{
	    	public String toString(){
	    		return "The mango is a fleshy stone fruit.";
	    	}
	    }, 
	    LEMON{
	    	public String toString(){
	    		return "Lemons are slow growing varieties of citrus.";
	    	}
	    } 
	}
	
	public static void main(String a[]){
		System.out.println(Fruit.GRAPE);
		System.out.println(Fruit.APPLE);
		System.out.println(Fruit.MANGO);
	}
}

Output:
A grape is a non-climacteric fruit.
The apple is the pomaceous fruit.
The mango is a fleshy stone fruit.
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List Of All Enum Programs:

  1. Basic Enum example.
  2. How to call enum, which is defined inside a class?
  3. How to override toString() method with enum?
  4. How to create custom constructor enum?
Knowledge Centre
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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