Examples of codes in java

Answer 1

public class Hello
{//opens the class
public static void main(String args[])
{//opens the main method
System.out.println("Hello World");
}//closes the main method

}//closes the class







Note: The compiler all the sentences that have "//" before them.

Answer 2

Predefined methods refers to the methods in the Java API. the methods that are present in the Java Class libraries that we can use.

Ex: String.equals() or Math.random() etc are predefined methods.