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* 局部代码块：在方法中出现，限定变量生命周期，及早释放，提高内存利用率
* 构造代码块（初始化块）在类中方法外出现：多个构造方法中相同的代码存放到一起，每次调用构造都执行，并且在构造方法前执行
* 静态代码块 package lesson02; public class demo03 { public static void main(String
[] args) { // TODO Auto-generated method stub /*3.静态代码块【常用】 *
1.在类中方法外出现，并加上static修饰； * 2.用于给类进行初始化，在加载的时候就执行，并且只执行一次。 * 3.一般用于加载驱动 * */
Student stu1= new Student("jsh","java班"); Student stu2 = new Student("dff",
"javaban"); } } class Student{ String name; String classname; //静态 static
String country; /* * 静态代码块作用 * 1.用于给类进行初始化，初始化就是给属性赋值 * 2.一般用于加载mysql驱动 *
3.如果有一段代码从始至终，只运行一次，可以写到静态代码块 */ //静态代码块 static { //静态只能访问静态 country = "中国";
System.out.println("静态代码块"); } public Student(String name, String classname) {
System.out.println("构造方法"); this.name = name; this.classname = classname; } }
