import java.lang.reflect.Constructor;

import java.util.Arrays;

public class Main01 {

public static void main(String[] args) throws Exception {

Main01.basic();

Main01.equal_or_instanceof();

Main01.basic_method();

Main01.class_constructor();

}

public static void basic() throws Exception {

System.out.println("\n#CLASS_basic");

Class z1 = String.class;

Class z2 = "233".getClass();

Class z3 = Class.forName("java.lang.String");

System.out.println(z1);

System.out.println(z2);

System.out.println(z3);

System.out.println(z1==z2);

System.out.println(z1==z3);

}

public static void equal_or_instanceof() {

System.out.println("\n#equal_or_instanceof");

Integer z1 = new Integer(233);

System.out.println(z1 instanceof Integer);

System.out.println(z1 instanceof Number);

System.out.println(z1.getClass()==Integer.class);

// System.out.println(z1.getClass()==Number.class); #compile error

}

public static void basic_method() throws Exception {

System.out.println("\n#basic_method");

Class z1 = String.class;

System.out.println(z1.getName());

System.out.println(z1.getSimpleName());

System.out.println(z1.getPackage().getName());

System.out.println(Runnable.class.isInterface());

System.out.println(java.time.Month.class.isEnum());

System.out.println(String[].class.isArray());

System.out.println(int.class.isPrimitive());

System.out.println("##superclass");

System.out.println(Integer.class.getSuperclass());

System.out.println(Object.class.getSuperclass());

System.out.println(Runnable.class.getSuperclass());

System.out.println(Arrays.toString(Integer.class.getInterfaces()));

System.out.println(java.util.List.class.isInterface());

System.out.println(Arrays.toString(java.util.List.class.getInterfaces()));

}

public static void class_constructor() throws Exception {

System.out.println("\n#class_constructor");

System.out.println((String) String.class.newInstance());

Constructor z1 = Integer.class.getConstructor(int.class);

System.out.println((Integer) z1.newInstance(233));

Constructor z2 = Integer.class.getConstructor(String.class);

System.out.println((Integer) z2.newInstance("233"));

}

}