java function interface example

Example 1: interface function

interface SearchFunc {
  (source: string, subString: string): boolean;
}

Example 2: how to implement a interface in java

interface methods{
 public static hey(); 
}

class scratch implements methods{
  // Required to implement all methods declared in an interface 
  // Or else the class becomes abstract
  public static hey(){
   System.out.println("Hey"); 
  }
}

Example 3: java define interface

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

Example 4: functional interface java

A functional interface is an interface that contains only one abstract method. They can have only one functionality to exhibit.