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Find output programs (Java String class)

Java String class | Find output of the programs: Here, we will practice the Java String class with some of the programs, we have to find output of the given java programs.
Submitted by IncludeHelp, on July 04, 2018

Program 1

public class iHelp
{
	public static void main (String[] args)
	{
		System.out.println("Google".charAt(3));
	}
}

Output

    g

Explanation

String.charAt() is a library function of String class, it returns character from given index of the string. Here, in the statement "Google".charAt(3) will return 'g', because 'g' exists on the 3^rd index.

Program 2

public class iHelp
{
	public static void main (String[] args)
	{
		System.out.println("Google"+3);
	}
}

Output

    Google3

Explanation

In java String, "+" is a concatenation operator, if we concatenate any number or string with the string, it returns that number/string concatenated to the string.

Here, "Google" is a string and 3 is a number. The resultant string of "Google"+3 will be "Google3".

Program 3

public class iHelp
{
	public static void main (String[] args)
	{
		System.out.println(10+20);
	}
}

Output

    30

Explanation

public class iHelp
{
	public static void main (String[] args)
	{
		if(System.out.println(10) == System.out.println(10))
			System.out.println("TRUE");
		else
			System.out.println("FALSE");
	}
}

    Main.java:6: error: 'void' type not allowed here
		    if(System.out.println(10) == System.out.println(10))
		                         ^
    1 error

public class iHelp
{
	public static void main (String[] args)
	{
		System.out.println(10+20+""+40);
	}
}

    3040