how to declare a interface in java

1// Assume we have the simple interface:
2interface Appendable {
3	void append(string content);
4}
5// We can implement it like that:
6class SimplePrinter implements Appendable {
7 	public void append(string content) {
8   		System.out.println(content); 
9    }
10}
11// ... and maybe like that:
12class FileWriter implements Appendable {
13 	public void append(string content) {
14   		// Appends content into a file 
15    }
16}
17// Both classes are Appendable.

1interface methods{
2 public static hey(); 
3}
4
5class scratch implements methods{
6  // Required to implement all methods declared in an interface 
7  // Or else the class becomes abstract
8  public static hey(){
9   System.out.println("Hey"); 
10  }
11}

1// Assume we have the simple interface:
2interface Appendable {
3	void append(string content);
4}
5// We can implement it like that:
6class SimplePrinter implements Appendable {
7 	public void append(string content) {
8   		System.out.println(content); 
9    }
10}
11// ... and maybe like that:
12class FileWriter implements Appendable {
13 	public void append(string content) {
14   		// Appends content into a file 
15    }
16}
17// Both classes are Appendable.
180
19how to implement a interface in java