java中的Map每次只能put一次，写段增强的put，可以一次put很多次

 1.精简版

package generic;import java.util.HashMap;
import java.util.Map;public class TestGenericMap{public Builder bd;public Map map(){return bd.map;}public static class Builder{Map map;public Builder(){map &＃61; new HashMap();}public Builder put(K k, V v){map.put(k, v);return this;}}public static void main(String[] args){TestGenericMap.Builder tm &＃61; new TestGenericMap.Builder();tm.put(1,"a").put(2,"b").put(3,"c");System.out.println(tm.map);}
}

2.相对精简版的增强版

package generic;import java.util.HashMap;
import java.util.Map;public class TestGenericMap{public Builder bd;public TestGenericMap(Builder bd){this.bd &＃61; bd;}public V get(K k){return bd.map.get(k);}public Map map(){return bd.map;}public static class Builder{Map map;public Builder(){map &＃61; new HashMap();}public Builder put(K k, V v){map.put(k, v);return this;}public TestGenericMap builder(){return new TestGenericMap(this);}}public static void main(String[] args){TestGenericMap.Builder tm &＃61; new TestGenericMap.Builder();tm.put(1,"a").put(2,"b").put(3,"c").builder().map();System.out.println(tm.builder().get(2));}
}


以上参考&＃xff1a;开发测试21天