java中类的复用分为3种：组合、继承、代理
1、组合：在新的类中产生现有类的对象，因为现有类的对象是新类的组成部分，所以被称为组合。
2、继承 继承就不用多说了
3、代理，java并没有对代理产生实际的支持，但很多工具中支持。
final关键字：
1、final数据：对于基本类型，数值不能改变；对于对象引用，引用不变，一旦一个引用指向一个对象，就不能将其指向另一个。
空白final：还是举例比较实在：
public class Test{
private final int i = 0; //直接初始化
private final int j; //如果此时为初始化，在每个不同的构造器中必须初始化，
Test(){
j = 1; // 构造器初始化
}
Test( int x ){
j = x; // 构造器初始化
// i = 2; 不能改变i的值
}
public void p(){
// j = 2; 非构造器中，不能改变其值
System.out.println("j:"+j);
}
}
2、final参数，如：
public void p(final int a){
System.out.println("a:"+a);
// a = 10; 不能更改值
}
3、final方法：很容易想到，final方法是不能被重写的
4、final类
final类是不可以被继承中。里面所以方法都隐式的指定为final。
小提示：Vector里面的数据不能存放基本类型，基本类型需要传换成包装类。
2024年1月27日 15:40
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