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最新推荐文章于 2023-10-19 15:03:50 发布

Javatangjie

最新推荐文章于 2023-10-19 15:03:50 发布

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分类专栏： java 文章标签： static

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本文通过一个具体的Java示例对比了static final域与final域之间的区别。static final域在类加载时即完成初始化，所有实例共享同一值；而final域在每个实例创建时初始化，不同实例间可能有不同的值。

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static final域和final域的区别

class SelfCounter {
    private static int count;
    private int id = count++;
    public SelfCounter(){
        System.out.println("SelfCounter()"+id);
    }
    public String toString(){
        return "SelfCounter "+ id;
    }
}
public class WithFinalFields {
    final SelfCounter scf = new SelfCounter();
    static final SelfCounter scsf = new SelfCounter();
    public String toString(){
        return "scf = " + scf + "\tscsf" + scsf;
    }
    public static void main(String[] args) {
        System.out.println("First object:");
        System.out.println(new WithFinalFields());
        System.out.println("Second object:");
        System.out.println(new WithFinalFields());
    }
}
运行结果:
SelfCounter()0
First object:
SelfCounter()1
scf = SelfCounter 1 scsfSelfCounter 0
Second object:
SelfCounter()2
scf = SelfCounter 2 scsfSelfCounter 0

这是think in java中的练习题我自己看的有点迷糊记录一下
Because class loading initializes the static final,类加载的时候已经初始化了static final域所以结果的第一个输出是:SelfCounter()0
it has the same value in both instances of WithFinalFields, whereas the regular final’s values are different for each instance.