public interface Iinterface{
public static String MY_NAME="Kenny";
public void displayText(String name);
}
[java]
 
Then implement the interface.
 
[java]
public class ImpelementingClass implements Iinterface{
public void displayText(String text){
System.out.println(MY_NAME+" says:"+text);
}
}

int x = getHeight(k2.left); 

int x = this.getHeight(k2.left); 

public static int getHeight(AvlNode t) {
  if ( t == null )
    return -1;
  else
    return t.height;
}

public int getHeight() {
  return this.height;
}

int x = k2.left.getHeight(); 

public int getHeight(JComponent comp)
{
	return(comp==null?-1:comp.getHeight());
	
}

public class Dog
{
    private String name;
 
    public void setName(String name)
    {
        // The follwing line does work...
        name = name; 
        // ...but it looks very odd.
        // The following usage is more common.
        this.name = name;
    }
}

public class Dog
{
    private String name;
 
    public void setName(String newName)
    {
        // No ambiguity.  No need for extra keywords
        // to clarify things.
        name = newName; 
    }
}

class HSBColor {
    int hue, saturation, brightness;
    HSBColor (int hue, int saturation, int brightness) {
        this.hue = hue;
        this.saturation = saturation;
        this.brightness = brightness;
    }

int x = getHeight(k2.left);
 
and int x = this.getHeight(k2.left);
 

import javax.swing.*;
public class ThisExample
{
 
	void checkTry()
	{
			JTextField tf = new JTextField();
			System.out.println("Print without this :"+getHeight((JComponent)(tf)));
			System.out.println("Print with this:"+getHeight((JComponent)(tf)));
	}
	public int getHeight(JComponent comp)
	{
		return(comp==null?-1:comp.getHeight());
		
	}
	public static void main(String args [])
	{
	
		new ThisExample).checkTry();
	}
}