why should i use interface in java code example

Example 1: 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 2: java interface

public interface Exampleinterface {
	
  public void menthod1();
  
  public int method2();

}

class ExampleInterfaceImpl implements ExampleInterface {


  	public void method1()
    {
        //code here
    }
  
    public int method2()
  	{
    	//code here
  	}

}

Example 3: how to declare a interface in java

// Assume we have the simple interface:
interface Appendable {
	void append(string content);
}
// We can implement it like that:
class SimplePrinter implements Appendable {
 	public void append(string content) {
   		System.out.println(content); 
    }
}
// ... and maybe like that:
class FileWriter implements Appendable {
 	public void append(string content) {
   		// Appends content into a file 
    }
}
// Both classes are Appendable.
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how to implement a interface in java