how to compile and run java program code example

Example 1: run java file

javac hello.java

Example 2: cmd java compile

javac MyFisrtProgam.java // enter to compile 
  java MyfirstProgram // run program

Example 3: java run project from command line

// Assuming that you have an executable jar
java -jar myJavaProject.jar

// Assuming that you have packaged jar
java -jar target/myJavaProject.jar

Example 4: how to compile and run java package program

/* File name : Animal.java */
package animals;
interface Animal {
   public void eat();
   public void travel();
}

Example 5: how to compile and run java package program

package animals;
/* File name : MammalInt.java */
public class MammalInt implements Animal {
   public void eat() {
      System.out.println("Mammal eats");
   }
   public void travel() {
      System.out.println("Mammal travels");
   }
   public int noOfLegs() {
      return 0;
   }
   public static void main(String args[]) {
      MammalInt m = new MammalInt();
      m.eat();
      m.travel();
   }
}