2銆佸皢鏌愪釜鏂規(guī)硶澹版槑涓篺inal
3銆佸皢鏌愪釜綾誨０鏄庝負(fù)final
絎竴縐嶆儏鍐靛緢綆鍗曪紝鑰屼笖瀹冪粡甯擱厤鍚坰tatic浣跨敤錛屽洜涓烘棦鐒舵槸甯擱噺錛屽垯瀵逛簬鎵鏈夊疄渚嬮兘鏄?
涓鏍風(fēng)殑錛屽畠涓嶉殢鐫瀹炰緥鑰屽彉鍖栵紝鎵浠ュ皢鍏跺０鏄庝負(fù)static銆備絾鏈変竴鐐歸渶瑕佹敞鎰忥紝鍗沖綋澹版槑浜?
涓涓猣inal鐨刼bject reference鏃訛紝娉ㄦ剰錛岃繖鏃惰皝涓哄父閲忥紵
鏄痳eference鏈韓榪樻槸referenc e鎸囧悜鐨勫璞★紵絳旀鏄墠鑰咃紝渚嬶細(xì)
public class Circle
{
private double rad;
public Circle(double r)
{
rad = r;
}
public void setRadius(double r)
{
rad = r;
}
public double getRadius()
{
return rad;
}
public static void main(String[] args)
{
private static final Circle p = new Circle(5);
p.setRadius(7); //OK,鍥犱負(fù)p涓哄父閲忥紝浣嗗畠鎵寮曠敤鐨?
//瀵硅薄涓嶆槸甯擱噺
p = new Circle(7); //Error錛屾敼鍙樹簡甯擱噺p鐨勫?
}
鐢變簬緙虹渷鎯呭喌涓嬶紝classes鎵鏈夌殑non-private,non-static鍑芥暟閮藉彲浠ヨ瀛愮被鎵澶嶅啓(over
ride)錛岄偅涔堝浣曞仛鎵嶈兘闃繪瀛愮被澶嶅啓鏌愪釜鍑芥暟鍛紵絳旀鏄皢璇ユ柟娉曞０鏄庝負(fù)final銆備緥錛?
public class Base
{
public void foo()
{
}
public final void bar()
{
}
}
public class Derived extends Base
{
public void foo()
{
}
/**
* can't override the final method of base class
*/
// public void bar()
// {
//
// }
}
閭ｄ箞鍏充簬final class錛屾垜鎯沖ぇ瀹墮兘鍙互鐚滃嚭鏉ヤ簡錛屽錛屽畠鐨勭洰鐨勫氨鏄槻姝㈠畠媧劇敓鍑哄瓙綾伙紝
鍏跺疄錛屽畠鐨勪綔鐢ㄧ瓑浠蜂簬灝嗚class閲岄潰鐨勬墍鏈夋柟娉曢兘澹版槑涓篺inal浜嗐傘婂畬銆?BR>
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