Question Practice Chapter 3 Java

Question: Write a Java program to Convert a String in Lowercase.
Ans:

package HelloWorld;

import java.util.Scanner;

public class LearningJava {

// write a java program to convert a string to lowercase;

public static void main (String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Give a String in Upper Case:");

String str = scan.nextLine();

System.out.print(str.toLowerCase());

}

}

1. yaha ham ek Scanner class le rhe hai jo ki predefined class hai 
2. String str name se ek string liya hai 
3. str.toLowerCase ek method hai jo ki kisi bhi string ko lowercase me convert krta hai aur ise ham camel convention me likhte hai 

Question: Write a Java program to convert a string in Uppercase

Ans:

package HelloWorld;

import java.util.Scanner; //this is a predefined scanner class for take
//input from user

public class LearningJava {

// write a java program to convert a string to uppercase;

public static void main (String[] args) {

Scanner scan = new Scanner(System.in); //this is scanner with "scan" name

System.out.print("Enter Your String in Lower case:");

String str = scan.nextLine(); //yaha ham ek string bna rhe str ke name se

System.out.print(str.toUpperCase()); //str.toUppercase se ham uppercase me
//convert krte hai

}

}

• yaha hamne sabse phle ek import java.util.Scanner; name se ek predefined class liya hai jissse ham user se input lete hai 
• Scanner scan = new Scanner(System.in) hamne ek scanner bnaya hai Scan ke name se jisse ham console ya user se data lete hai 
• String str = scan.nextLine(); user se string input le rhe aur str name se save kr rhe 
• System.out.print(str.toUpperCase()); ham print kr rhe string jo hamne save kiya tha str ke name se use upper case me

Question:Write a java Program to replace Spaces into Underscore Chapter 3

Ans: 

package HelloWorld;

import java.util.Scanner;

public class LearningJava {

// write a java program to replace a spaces into underscore;

public static void main (String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Enter your String with Spaces:");

String str = scan.nextLine();

System.out.print(str.replace(" ", "_"));

}

}

Question: Write a JAVA program to fill in a letter template which looks like below -

letter = "dear <\name\>, Thanks a lot!
Ans:

package HelloWorld;

import java.util.Scanner;

public class LearningJava {

// write a java program to replace a spaces into underscore;

public static void main (String[] args) {

Scanner scan = new Scanner(System.in);

System.out.print("Enter Your Name:");

String str = scan.nextLine();

System.out.print("Dear" + " " +str+ " " + "Thanks a lot" );

}

}