1、虚拟机在首次加载Java类时,会对静态初始化块、静态成员变量、静态方法进行一次初始化 public class Parent { public static int t = parentStaticMethod2(); { System.out.println("父类非静态初始化块"); } static { System.out.println("父类静态初始化块"); } public Parent() { System.out.println("父类的构造方法"); } public static int parentStaticMethod() { System.out.println("父类类的静态方法"); return 10; } public static int parentStaticMethod2() { System.out.println("父类的静态方法2"); return 9; } @Override protected void finalize() throws Throwable { // TODO Auto-generated method stub super.finalize(); System.out.println("销毁父类"); } } public class Child extends Parent { { System.out.println("子类非静态初始化块"); } static { System.out.println("子类静态初始化块"); } public Child() { System.out.println("子类的构造方法"); } public static int childStaticMethod() { System.out.println("子类的静态方法"); return 1000; } @Override protected void finalize() throws Throwable { // TODO Auto-generated method stub super.finalize(); System.out.println("销毁子类"); } } public class Test { public static void main(String[] args) { // TODO Auto-generated method stub Parent.parentStaticMethod(); // Child child = new Child(); } } 输出 父类的静态方法2 父类静态初始化块 父类类的静态方法 类中static 方法在第一次调用时加载,类中static成员按在类中出现的顺序加载。当调用静态方法2时输出 父类的静态方法2 父类静态初始化块 父类的静态方法2 注释掉Parent.parentStaticMethod(); 去掉注释Child child = new Child();
|
|