Thread: run time error: same program running in jdk19 but not in jdk1.7.5 Why?

run time error: same program running in jdk19 but not in jdk1.7.5 Why?

In my laptop i installed jdk19 program successfully runned,but in my college old version jdk 1.7.5 same program compiled,but runtime error. What should I do?

 
import java.util.Scanner;
public class ReplaceExample
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a String");
        String str = sc.nextLine();
        System.out.println("The String input using Scanner class is: " +str);
	  System.out.print("String before replacing : ");
        System.out.println(str);
 
        System.out.print("After replacing all e with A : ");
        System.out.println(str.replace('e', 'A'));
 
        System.out.print("After replacing all Engineering with Arts : ");
        System.out.println(str.replace("Engineering","Arts"));
 
 
    }
}

k. Tomorrow I have Lab Session. I will note that error.

Error:could not find or load main class JavaExample
caused by java.lang.classNot FoundException:JavaExample

ReplaceExample.java,JavaExample.java both my lab program shows this Exception.
Error:could not find or load main class JavaExample
caused by java.lang.classNot FoundException:JavaExample

Error:could not find or load main class ReplaceExample
caused by java.lang.classNot FoundException:ReplaceExample
both programs compiled without error,but the class file does not create in this saved location.