Common Errors in Java Program

Hello World Program

public class Helloworld{
public static void main(String args[]){
System.out.println("Hello World");
}
}

Common Errors

• Class name should match Filename

// File named: HelloWorld.java
public class HelloWorld {  // CORRECT: Class name matches filename
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

• Java is Case Sensitive (eg., 'system should be System')

System.out.println("Hello, World!");

• Class name must start with Uppercase

public class HelloWorld 

• Every end of statements must have semicolons

System.out.print("Hello");
System.out.println("World!");

• To print a string, use double quotes

System.out.print("Hello");

• To print a single character,use single quotes

System.out.print('c');

• Use Proper Braces

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }  // CORRECT: Braces properly placed
}