String Manipulation (Java)

Hydrase

Jul 8th, 2025 (edited)

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import java.util.Scanner;
class strman
{
public static void main(String args[])
{
String s1,s2;
Scanner sc=new Scanner(System.in);
int ch;
System.out.println("Enter 2 strings: ");
s1=sc.next();
s2=sc.next();
System.out.print("\n");
do
{
System.out.print("MENU\n----------\n1.Equality\n2.Concatenate\n3.Replace\n4.Toggle\n5.Exit\n");
System.out.println("Enter your choice");
ch=sc.nextInt();
switch(ch)
{
case 1: if(s1.equals(s2))
System.out.println(s1+"="+s2);
else
System.out.println(s1+"!="+s2);
break;
case 2: System.out.println("The concatenated string is: "+s1.concat(s2));
break;
case 3: System.out.println("Enter string 1 or 2");
int u=sc.nextInt();
if(u==1)
{
System.out.println("Enter character to be replaced");
String oldc=sc.next();//oldc=sc.next().charAt(0);
System.out.print("Enter replacement character");
String newc=sc.next();//char newc=sc.next().charAt(0);
String m=s1.replace(oldc,newc);
System.out.println("Modified String: "+m);
break;
}
else if(u==2)
{
System.out.println("Enter character to be replaced");
String oldc=sc.next();//oldc=sc.next().charAt(0);
System.out.print("Enter replacement character");
String newc=sc.next();//char newc=sc.next().charAt(0);
String m=s2.replace(oldc,newc);
System.out.println("Modified String: "+m);
break;
}
else
{
System.out.print("Invalid choice");
break;
}
/*for(int i=0;i<s1.length();i++)
{
if(s1.charAt(i)==oldc)
m+=newc;
else
m+=s1.charAt(i);
}*/
case 4: s1.toUpperCase();
break;
case 5: System.exit(0);
System.out.print("\n");
default: System.out.println("Invalid choice");
}
}while(ch<=5);
}
}

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