Java syntax
part 33/46 · 86.7 KB total
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• A direct superinterface of C declares or inherits a method (which is therefore necessarily abstract) and C neither declares nor inherits a method that implements it.
• A subclass of an abstract class that is not itself abstract may be instantiated, resulting in the execution of a constructor for the abstract class and, therefore, the execution of the field initializers for instance variables of that class.
package org.dwwwp.test;
/**
* @author jcrypto
*/
public class AbstractClass {
private static final String hello;
static {
System.out.println(AbstractClass.class.getName() + ": static block runtime");
hello = "hello from " + AbstractClass.class.getName();
}
{
System.out.println(AbstractClass.class.getName() + ": instance block runtime");
}
public AbstractClass() {
System.out.println(AbstractClass.class.getName() + ": constructor runtime");
}
public static void hello() {
System.out.println(hello);
}
}
package org.dwwwp.test;
/**
* @author jcrypto
*/
public class CustomClass extends AbstractClass {
static {
System.out.println(CustomClass.class.getName() + ": static block runtime");
}
{
System.out.println(CustomClass.class.getName() + ": instance block runtime");
}
public CustomClass() {
System.out.println(CustomClass.class.getName() + ": constructor runtime");
}
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