Question { 1618 }

Why are strings immutable in Java?

Answer

Strings in java are frequently used for hashmap keys. Now if someone changes the value of the string it will cause severe discrepancies. Hence strings are made immutable.

Question { 1545 }

How to convert string to int in java?

Answer

"class Scratch{
public static void main(String[] args){
String str = ""50"";
System.out.println( Integer.parseInt( str )); // Integer.parseInt()
}
}"

Question { 1864 }

How to use scanner in java?

Answer

import java.util.Scanner;

class classname{
public methodname(){
//Scanner declaration
Scanner s_name = new Scanner(System.in);
//Use Scanner to take input
int val = s_name.nextInt();
}
}