Java 8 Interface Defaults example

Class1.java

package net.shadowfacts.example;

/**
 * A class that implements Interface1 but only has one custom value.
 **/
public class Class1 implements Interface1 {
  
  public String name() {
    return "Class1";
  }
  
  public int method1() {
    return 1;
  }
  
  public float method2() {
    return 3.1f;
  }
  
  public boolean method3() {
    return true;
  }
  
}

Class2.java

package net.shadowfacts.example;

/**
 * A class that implements Interface2 and is only required to implement 1 method because the other 3 have default implementations in Interface2
 **/
public class Class2 implements Interface1 {
  
  public String name() {
    return "Class2";
  }
  
}

Interface1.java

package net.shadowfacts.example;

/**
 * An interface
 **/
public interface Interface1 {
  
  String name();
  
  int method1();
  
  float method2();
  
  boolean method3();
}

Interface2.java

package net.shadowfacts.example;

/**
 * An interface extending Interface1
 **/
public interface Interface2 extends Interface1 {
  
  default method1() {
    return 1;
  }
  
  default method2() {
    return 3.1f;
  }
  
  default method3() {
    return true;
  }
  
}