Why does it print "ALL"

[Esther Kak]

Can somebody explain this.....Why does it print "ALL"

 class A{
public String toString(){
return "ALL";
}
}
public class Tester{
 
public static void main (String args[]){
A a1[] = new A[1];
A a2[][] = new A[2][];
A a3[][][] = new A[3][][];
a1[0] = new A();
System.out.println(a1[0]);
 

}
}
   

[Andy Morris]

Because toString() is automatically invoked by your System.out.println() invocation and since you overwrote that method it prints out 'ALL'.

[Henry Wong]

The PrintStream's println() method that takes an Object, calls toString() to get a string object to print.

Henry