java - 如何手动填写HashMap？

Question

如何手动填写下面的HashMap？

public static final HashMap<String,int[]> AGE_GROUPS = {"18-24",{18,24},
                                                        "25-29",{25,29},
                                                        "30-39",{30,39},
                                                        "40-49",{40,49},
                                                        "50-59",{50,59},
                                                        "60-69",{60,69},
                                                        "70-79",{70,79},
                                                        "80+",{80,120}};

Answer 1

这称为静态初始化。

 private static final Map<Integer, String> myMap;
    static {
        Map<Integer, String> aMap = ....;
        aMap.put(1, "one");
        aMap.put(2, "two");
        myMap = Collections.unmodifiableMap(aMap);
    }

根据您的情况；

public static final Map<String, int[]> AGE_GROUPS;
    static{
        Map<String, int[]> otherMap = new HashMap<String, int[]>();
        otherMap.put( "10-20", new int[]{ 10, 11 } );
        otherMap.put( "20-30", new int[]{ 20, 21 } );

        AGE_GROUPS = Collections.unmodifiableMap( otherMap );

    }