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OOP/Java/Lab/Week9/menu_main2.java

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+import java.util.Scanner;
+
+public class menu_main2 {
+
+    public int compare(String st1,String st2)
+    {
+        return st1.compareTo(st2);
+    }
+
+    public String caseConvert(String st)
+    {
+        String converted="";
+        for(int i=0;i<st.length();i++){
+            char ch = st.charAt(i);
+            if(Character.isUpperCase(ch)){
+                converted+=Character.toLowerCase(ch);
+            }
+            else{
+                converted+=Character.toUpperCase(ch);
+            }
+        }
+        return converted;
+    }
+
+    public boolean substring(String st,String sub)
+    {
+        return st.contains(sub);
+    }
+
+    public StringBuffer hello(String st,String sub)
+    {
+        int index = st.indexOf(sub);
+        StringBuffer sb = new StringBuffer(st);
+        sb.replace(index,index+sub.length(),"Hello");
+        return sb;
+    }
+
+    public static void main(String[] args) {
+        menu_main2 obj = new menu_main2();
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter:\na. To compare two strings\nb. To convert the uppercase character to lower and vice-versa\nc. To display whether an entered string is a substring of the other or not\nd. If the entered string is a substring of the other, replace it with Hello");
+        char choice = sc.nextLine().charAt(0);
+        System.out.println("Enter string");
+        String str1 = sc.nextLine();
+        String str2;
+        switch(choice)
+        {
+            case 'a':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Comparison:"+obj.compare(str1,str2));
+                break;
+            case 'b':
+                System.out.println("String in converted case:"+obj.caseConvert(str1));
+                break;
+            case 'c':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Is it a substring:"+obj.substring(str1,str2));
+                break;
+            case 'd':
+                System.out.println("Enter string to be checked");
+                str2 = sc.nextLine();
+                System.out.println("Substituting hello string is:"+obj.hello(str1,str2));
+                break;
+        }
+    }
+}