ram3.java

class Main {
  public static void main(String[] args) {

    String str = "Radar", reverseStr = "";
    
    int strLength = str.length();

    for (int i = (strLength - 1); i >=0; --i) {
      reverseStr = reverseStr + str.charAt(i);
    }

    if (str.toLowerCase().equals(reverseStr.toLowerCase())) {
      System.out.println(str + " is a Palindrome String.");
    }
    else {
      System.out.println(str + " is not a Palindrome String.");
    }
  }
}
Run Code
Output

Radar is a Palindrome String.
In the above example, we have a string "Radar" stored in str. Here, we have used the

1. for loop to reverse the string

The loop runs from the end to the beginning of the string.
The charAt() method accesses each character of the string.
Each character of the string is accessed in reverse order and stored in reverseStr.
2. if statement to compare str and reverseStr

The toLowerCase() method converts both str and reverseStr to lowercase. This is because Java is case sensitive and 'r' and 'R' are two different values.
The equals() method checks if two strings are equal.
Example 2: Java Program to Check Palindrome Number
class Main {
  public static void main(String[] args) {
    
    int num = 3553, reversedNum = 0, remainder;
    
    // store the number to originalNum
    int originalNum = num;
    
    // get the reverse of originalNum
    // store it in variable
    while (num != 0) {
      remainder = num % 10;
      reversedNum = reversedNum * 10 + remainder;
      num /= 10;
    }
    
    // check if reversedNum and originalNum are equal
    if (originalNum == reversedNum) {
      System.out.println(originalNum + " is Palindrome.");
    }
    else {
      System.out.println(originalNum + " is not Palindrome.");
    }
  }
}
Run Code
Output

3553 is Palindrome.
In the above example, we have a number 3553 stored in num and originalNum variables. Here, we have used the

while loop to reverse num and store the reversed number in reversedNum
if...else to check if reversedNum is same as the originalNum
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