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public class Wurf
{
	public static void main (String[]args)
	{
		Ball objekt = new Ball ();
		objekt.drucken(); 
	}
}

class Ball
{
	int ballgroesse = 5;
	
	public void drucken()
	{
		System.out.println(ballgroesse);
	}
}

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class Ball
{
	//...

	@Override
	public String toString() {
		return "ich bin ein Ball!";
	}
}

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Mensch m = new Mensch();
System.out.println(m);

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Mensch m = new Mensch();
String s = "Mensch: " + m;

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Mensch m = new Mensch();
String s = "Mensch: " + m.toString();

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package javatostring;  
public class JavatoString  
{    
 public static void main(String[] args)     
{         Multiplikation multi = new Multiplikation ();         
multi.toString();     } }

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package javatostring;  
public class Multiplikation  
{     
public String toString()     
{         
String name = "Test";        
return name;       }    }

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System.out.println(multi.toString());

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System.out.println(multi);