package Set_zero;import java.util.Scanner;public class q1{ public static void main(String[] args){ Scanner s = new Scanner(System.in); String s1; System.out.println("Enter your input : "); s1 = s.next(); System.out.println("Your given String input is : " + s1); }}package Set_zero;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Scanner;public class q2 {public static void main(String[] args) throws IOException{ Scanner x = new Scanner(System.in); String a; System.out.println("Input any name : "); a = x.nextLine(); System.out.println("taken input was : "+a+"\n"); System.out.println("Input any name : "); BufferedReader c = new BufferedReader(new InputStreamReader(System.in)); a = c.readLine(); System.out.println("taken input was : "+a);}}package Set_zero;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class q3 {public static void main(String[] args) throws IOException{ String a; String b; String d; BufferedReader c = new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter First Sentense : "); a = c.readLine(); System.out.println("Enter second Sentense : "); b = c.readLine(); d = a+ " " + b; System.out.println("Concatanated String is : "+d);}}package Set_zero;public class q4 { public static void main(String[] args){ //Using format() Method String a = String.format("Headecimal value of 10 is : %x",10); System.out.println(""+a); String b = String.format("|%10d|", 3344); System.out.println("Formatted version of 3344 : "+b); String c = String.format("|%-10d|", 3344); System.out.println("Formatted version of 3344 : "+c); //Using Trim Method String d = " Saiki Sarkar "; System.out.println(d.trim()); //Using concat() Method String e = "http://"; e = e.concat("sites.google.com").concat("/").concat("view/ytosko"); System.out.println(e); //Using replace() Method String f = "Saiki is revert"; String g = f.replace('a','i'); System.out.println(g); //Using replaceAll() Method String h = "Saiki is revert"; String i = f.replaceAll("a","i"); System.out.println(i); //Using toString() Method Integer j = 12980; System.out.println(j.toString()); //Using substring() Method String k = "abdxaviicom"; System.out.println(k.substring(3,8)); //Using contains() Method String l = "A game of thrones conquest"; System.out.println(l.contains("GAME")); System.out.println(l.contains("conquest")); //Using split() Method String m = "Saiki@shanta"; String[] n = m.split("@",2); for(String o : n) System.out.println(o); }}Source Code :