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  • java EnumSet

     enum FrontConstant{plain,bold,italic}
        public static void main(String[] args) {
    
            EnumSet<FrontConstant> es=EnumSet.of(FrontConstant.plain);//#14
            Iterator it=es.iterator();
    
            System.out.println("17");
            while (it.hasNext())
                System.out.println(it.next());//es初始化了一个元素plain 输出plain
            System.out.println("20");
    
            System.out.println("22");
            System.out.println(EnumSet.complementOf(es));//#14是plain 剩下bold和italic 输出{bold,italic}
            System.out.println("24");
    
            EnumSet<FrontConstant> es2=EnumSet.noneOf(FrontConstant.class);
            es2.add(FrontConstant.plain);//#27
            System.out.println("28");
            System.out.println(EnumSet.complementOf(es2));//#27是plain 剩下bold和italic 输出{bold,italic}
            System.out.println("30");
    
            ArrayList<FrontConstant> a1=new ArrayList<FrontConstant>();
            a1.add(FrontConstant.plain);
            a1.add(FrontConstant.italic);
    
            EnumSet<FrontConstant> es3=EnumSet.copyOf(a1);
            System.out.println("37");
            System.out.println(EnumSet.complementOf(es3)); //es3初始化后已经包含 plain和italic 剩下bold输出bold
            System.out.println("39");
           
            }
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  • 原文地址:https://www.cnblogs.com/kexb/p/10125416.html
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