java interface

1// interface in java example
2interface Vehicle
3{
4   public void accelerate();
5}
6class BMW implements Vehicle
7{
8   public void accelerate()
9   {
10      System.out.println("BMW accelerating...");
11   }
12}
13public class InterfaceDemo
14{
15   public static void main(String[] args)
16   {
17      BMW obj = new BMW();
18      obj.accelerate();
19   }
20}

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/* File name : MammalInt.java */
2public class MammalInt implements Animal {
3
4   public void eat() {
5      System.out.println("Mammal eats");
6   }
7
8   public void travel() {
9      System.out.println("Mammal travels");
10   } 
11
12   public int noOfLegs() {
13      return 0;
14   }
15
16   public static void main(String args[]) {
17      MammalInt m = new MammalInt();
18      m.eat();
19      m.travel();
20   }
21} 

1public interface Exampleinterface {
2	
3  public void menthod1();
4  
5  public int method2();
6
7}
8
9class ExampleInterfaceImpl implements ExampleInterface {
10
11
12  	public void method1()
13    {
14        //code here
15    }
16  
17    public int method2()
18  	{
19    	//code here
20  	}
21
22}

1class ACMEBicycle implements Bicycle {
2
3    int cadence = 0;
4    int speed = 0;
5    int gear = 1;
6
7   // The compiler will now require that methods
8   // changeCadence, changeGear, speedUp, and applyBrakes
9   // all be implemented. Compilation will fail if those
10   // methods are missing from this class.
11
12    void changeCadence(int newValue) {
13         cadence = newValue;
14    }
15
16    void changeGear(int newValue) {
17         gear = newValue;
18    }
19
20    void speedUp(int increment) {
21         speed = speed + increment;   
22    }
23
24    void applyBrakes(int decrement) {
25         speed = speed - decrement;
26    }
27
28    void printStates() {
29         System.out.println("cadence:" +
30             cadence + " speed:" + 
31             speed + " gear:" + gear);
32    }
33}
34