default constructor explained

Foo.java

package constructors.baseExample;

public class Foo {
	int size;
	String name;

	Foo(String name, int size) {
		this.name = name;
		this.size = size;
	}

	public static void main(String[] args) {
		//Foo foo = new Foo(); compilation fails as it doesn't have default no-arg constructor
		
		Foo foo2 = new Foo("Fred", 43);// No problem. Arguments match the Foo constructor
	}
}