Class获取_知识点

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2种获取class的方式的区别

1. Class.forName("")

2. *.class

package context;import java.util.Random;public class ClassInitialization {public static final Random rand = new Random();public static void main(String[] args) throws ClassNotFoundException {//.class使用懒加载,使用非编译期常量时初始化；编译期间检查Class c1 = Initable1.class;System.out.println("afer create Initable1");System.out.println("static final param: " + Initable1.staticFinal1);System.out.println(Initable1.staticFinal2);System.out.println("--------");//Class.forName方法调用即初始化;运行期间检查Class c2 = Class.forName("context.Initable2");System.out.println("after create Initable2");System.out.println(Initable2.staticFinal1);//泛型的用法:  ?通配符Class<? extends Number> c = int.class;}}class Initable1 {static final int staticFinal1 = 47;   //编译期常量static final int staticFinal2 = ClassInitialization.rand.nextInt();    //非编译期常量static {System.out.println("initial Initable1");}}class Initable2 {static final int staticFinal1 = 125;static {System.out.println("initial Initable1");}}

//outputafer create Initable1static final param: 47initial Initable1963871024--------initial Initable1after create Initable2125

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