JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Built-in Java Annotations: @SuppressWarnings example


Description:

Incase if you don't want to get any warnings from compiler for the known things, then you can use @SuppressWarnings annotation. For example, you are calling deprecated method, and you know that it is deprecated, to avoid compiler warnings, user @SuppressWarnings annotation.


Code:
package com.java2novice.annotations;

public class MyDeprecatedExmp {
	
	@Deprecated
	public void showDeprecatedMessage(){
		System.out.println("This method is marked as deprecated");
	}
	
	@SuppressWarnings("deprecation")
	public static void main(String a[]){
		
		MyDeprecatedExmp mde = new MyDeprecatedExmp();
		mde.showDeprecatedMessage();
	}
}
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Interface and its usage
Interface is similar to a class which may contain method's signature only but not bodies and it is a formal set of method and constant declarations that must be defined by the class that implements it. Interfaces are useful for declaring methods that one or more classes are expected to implement, capturing similarities between unrelated classes without forcing a class relationship and determining an object's programming interface without revealing the actual body of the class.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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