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A (concrete) class defines all his methods and can have any kind of instance variable and is declared with the 'class' keyword. Unlike an interface that doesn't implements any of his methods and his variables must be static and final. An interface is defined with the 'interface' keyword.

//This is a class

public class MyClass{

public String name;

private int age;

public void myMethod(){

//do something

}

}

//This is a interface

interface MyInterface {

public static final String name;

public static final int age;

public void myMethod(); // This method is not implemented

}

An other difference is that a class can be inheritance by other class but a interface must be implemented using the keyword 'implements'.

interface Runnable(){

void run();

}

public class MyOtherClass implements Runnable{

public void run(){

// insert interesting code here

}

}

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