why is the output strange..

[ashu Suri]

Run this program and we get extra "Testclass" in the ouput.
Can anybody explain where is it coming from?


public class Test {

public static String text = new String();

public static void main(String args[]){

System.out.println(text.getClass());

System.out.println(text.getClass()+ " unknown " + new Test().test());
}

public String test(){
System.out.print(getClass());
return "";
}

}

Thanks,
Gagan

[salvin francis]

1. use code tags.

2. This is the output i am getting:

class java.lang.String
class Testclass java.lang.String unknown 

[Rob Spoor]

Order of execution:
- System.out.println(text.getClass()) // prints "class java.lang.String" with an enter
- retrieve text.getClass() // returns a Class object for String
- append that Class object with " unknown "; the Class object is turned into a String using its toString method, and the result is "class java.lang.String unknown "
- call new Test().test()
- inside that method, print out getClass() // prints "class Test" without an enter
- inside that method, return ""
- take the return value and append it to the previous String. It is know "class java.lang.String unknown "
- print out that String // prints "class java.lang.String unknown " with an enter

Since one of the print outs misses an enter (print is called, not println) the "class Test" and "class java.lang.String unknown " are printed directly after each other.

[salvin francis]

I agree with Rob,

try this version of your program:

public class Test{

	public static String text = new String();

	public static void main(String args[]){
		System.out.println("A. "+text.getClass());
		System.out.println("B. "+text.getClass()+ " unknown " + new Test().test());
	}

	public String test(){
		System.out.println("C. "+getClass());
		return "";
	}
} 

output:

A. class java.lang.String
C. class Test
B. class java.lang.String unknown 

Does this answer your query?