public void demo(){
private Map mMap = new HashMap();
mMap.put("k1","v1");
mMap.put("k2","v2");
}
第二种 java8新特性-双括号初始化
public void demo(){
private Map mMap = new HashMap(){{
put("k1","v1");
put("k2","v2");
}}
}
第三种 java9新特性-最简便的方式
public void demo(){
Map.of("k1","v1","k2","v2")
}
第四种 Guava
public void demo(){
Map mMap = ImmutableMap.of("k1","v1","k2","v2");
}
