The Java program can correspond to a Class object at runtime, which can be obtained from the class object from the Class object, for example:
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Public class myclass {
Public static void main (string [] args) {string name = "zhujun"; class c = name.getClass (); system.out.println ("getname:" c.getname ()); system.out.println ("Isinterface:" C.isinterface ()); System.out.println ("isprimities:" C.isprimitive ()); System.out.println ("Isarray:" C.isaRray ()); system .out.println ("superclass:" c.getsuperclass (). getName ());}}} output:
GetName: java.lang.stringisinterface: Falseisprimities: FalseisArray: Falsesuperclass: java.lang.object
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For simple types Boolean, Byte, CHAR, SHORT, INT, Long, Float, Double, and keyword void, the corresponding Class object can be obtained by class constant class, for example:
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Public class myclass {public static void main (string [] args) {system.Out.println (boolean.class.getname ()); system.class.println (boolean.class.indln; system.out.println (void.class.getname ());}}
Output results:
Boolean True Void
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The Class class has a forName () static method, which can be obtained from the corresponding class name (Class Name), for example::
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Class testclass {
Void Say () {
System.out.println ("this is instance of testclass):
}} Public class Main {public static void main (String [] args) {try {Class c = Class.forName ( "TestClass"); TestClass testClass = c.newInstance (); testClass.say ();} catch (ClassNotFoundException e) {E.PrintStackTrace ();}}} output:
This is instance of testclass, IS ISTANCE OF TESTCLASS
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