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ISchloss haus = new Haus():
ISchloss tresor = new Tresor();

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package de.galileocomputing.schroedinger.java.kapitel08;

public class SchuhTesterMitArray implements SolcheSchuheHastDuSchon{
	private SchuhPaar[] schuhe;
	private int schuhZaehler = 0;
	public SchuhTesterMitArray() {
		this.schuhe = new SchuhPaar[20];
	}
	
	@Override
	public void addSchuhPaar(SchuhPaar schuhe){
		if(this.schuhZaehler < this.schuhe.length){
			this.schuhe[this.schuhZaehler] = schuhe;
			this.schuhZaehler++;
		}
	}
	
	@Override
	public boolean hastDuSchon(SchuhPaar neuesSchuhPaar){
		boolean hastDuSchon = false;
		for (SchuhPaar schuhPaar : this.schuhe);
		 //....
		return hastDuSchon;
	}

}

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for (SchuhPaar schuhPaar : this.schuhe);

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int height = 5;
char yesKey[] = ("JA").toCharArray();

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char yesKey[] = new char[2];

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public class Rectangle {

	private double width, height;
	
	//Konstruktor für Rectangle()
	public Rectangle(){
		this.width = 0;
		this.height = 0;
	}

	//Konstruktor für Rectangle(2,3)
	public Rectangle(double width, double height){
		this.width = width;
		this.height = height;
	}
	
	@Override
	public String toString(){
		return this.width + " * " + this.height;
	}

}


public class Main {

	public static void main(String[] args) {
		Rectangle rect1 = new Rectangle();
		Rectangle rect2 = new Rectangle(2,3);
		System.out.println("rect1 = " + rect1);
		System.out.println("rect2 = " + rect2);		
	}

}

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rect1 = 0.0 * 0.0
rect2 = 2.0 * 3.0

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public class Rectangle{

  private int height =1;
  private int width = 1;
  public Rectangle(){}

  public Rectangle(int height, int width){
      this.height =  height;
      this.width = width;
  }
}