Java Programming - Inner Classes - Discussion
Discussion Forum : Inner Classes - Finding the output (Q.No. 3)
3.
What will be the output of the program?
public class TestObj
{
public static void main (String [] args)
{
Object o = new Object() /* Line 5 */
{
public boolean equals(Object obj)
{
return true;
}
} /* Line 11 */
System.out.println(o.equals("Fred"));
}
}
Answer: Option
Explanation:
This code would be legal if line 11 ended with a semicolon. Remember that line 5 is a statement that doesn't end until line 11, and a statement needs a closing semicolon!
Discussion:
6 comments Page 1 of 1.
Madhu said:
2 decades ago
Plz explain how the semicolon plays a significant role here. Am not getting the syntax of adding semicolon at line 11.
Please explain above programme in detail.
Thanx in advance.
Please explain above programme in detail.
Thanx in advance.
Dips said:
1 decade ago
How come the code from line 5 to line 11 becomes a statement? I'm getting confused, please respond as quickly as possible.
Thomas said:
1 decade ago
No need to be confused. In line 5 a method inner class, that inherits from Object is defined. This ends with the line after the line marked as Line 11. Read more on:
http://download.oracle.com/javase/tutorial/java/javaOO/innerclasses.html
http://download.oracle.com/javase/tutorial/java/javaOO/innerclasses.html
Zorba said:
1 decade ago
It's an anonymous class - google it.
They are used to overwrite methods in the initial class.
Here the method equals in the class Object is overwritten.
Did it helped ?
A semicolon is mandatory after such a declaration.
They are used to overwrite methods in the initial class.
Here the method equals in the class Object is overwritten.
Did it helped ?
A semicolon is mandatory after such a declaration.
Sohi said:
1 decade ago
Normally we use like :
Object o = new Object();
Hence we are creating anonymous class the syntax will looks like:
Object o = new Object(){ /*-code for anonymous class--*/};
From Question if it should be like:
Object o = new Object(){
public boolean equals(Object obj)
{
return true;
}
}; /* Line 11 */
Object o = new Object();
Hence we are creating anonymous class the syntax will looks like:
Object o = new Object(){ /*-code for anonymous class--*/};
From Question if it should be like:
Object o = new Object(){
public boolean equals(Object obj)
{
return true;
}
}; /* Line 11 */
Bhanu Pratap Singh said:
1 decade ago
System.out.println(o.equals("Fred")); This line is calling the equals() function with "Fred" as a argument.
But this function is accepting Object value.
I am not understanding this code ?
Why we are not using following line.
/**********************************************/
public boolean equals(String s){
return true;
}
/**********************************************/
But this function is accepting Object value.
I am not understanding this code ?
Why we are not using following line.
/**********************************************/
public boolean equals(String s){
return true;
}
/**********************************************/
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