The definition of java-based interface

 1. The basic definition of the interface:

public interface interface name { 
    // interface content 
} 
call format:

public class implements the interface implementation class name name { 
    // ... 
} 

abstract methods defined in an interface 2. The 
plus " abstract " Keywords 
example: 

public abstract interface Interface Name {

    // interface content 
} default interface 3. The method defined

Plus the " default " keyword 

static methods defined interface 4. 
add " static" keyword

5. The method defined private interface

Plus " Private " keyword 
constants defined 6. Interface

Add keywords: public static final constant name in uppercase