, Hello, Java, Hello, World]
}
}
删除方法
boolean remove(Object obj);
删除集合中的指定元素,删除成功返回true,未找到指定元素...("Buffer", 23);
map.put("Balance", 23);
map.put("Amy", 32);
Set<Entry<String...("Buffer", 23);
map.put("Balance", 23);
map.put("Amy", 32);
System.out.println...hashMap.put(new Student("Buffer", 22, '男'), 3);
hashMap.put(new Student("Buffer", 23, '女'), 4...(new Student("Buffer",23,'男'), 1);
treeMap.put(new Student("Buffer",22,'男'), 1);
treeMap.put