Java Day 2

 

DAY 2

1. Choose the correct output among the following options.
import static java.util.Arrays.toString;


class Main{
    public static void main(String[] args) {
        printArgs(1,2,3,4,5);
    }
    static void printArgs(Object... args){
        System.out.println(toString(args));
    }
}
1. Actual and formal argument lists differ in length, compile time error.
2. Syntax error
3. [1,2,3,4,5]
4. 1-2-3-4-5@e234545

i. Actual and formal argument lists differ in length, compile time error.
error: method toString in class Object cannot be applied to given types;
System.out.println(toString(args));
Explanation: Internally the toString(args) is converted to this.toString(args), so the toString() method of Object class is called because it is the nearest reference.
If we write Arrays.toString(args) and import java.util.Arrays, then we will get [1,2,3,4,5] as output.

2. Choose the correct output among the following options.
/**
 * Generated by DC Sharma.
 * from E:TestRoot\apps\units\include\Alpha.dll
 * Date: April 27, 2023
 */


class T{
    public static void main(String[] args) {
        System.out.print("Hell");
        System.out.println("o class");
    }
}

Compile time error: illegal unicode escape
* from E:TestRoot\apps\units\include\Alpha.dll
Explanation: \u is treated as unicode starting and after that is not a valid unicode. Java supports Unicode i.e., we can write our whole Java source code in unicode also.