content: package class03;
  
  import java.util.HashMap;
  import java.util.TreeMap;
  
  public class Code05_HashMapTreeMap {
  
  	public static class Node {
  		public int value;
  
  		public Node(int v) {
  			value = v;
  		}
  	}
  
  	// (K V)表
  	public static void main(String[] args) {
  		HashMap<String, String> map = new HashMap<>();
  		map.put("zuochengyun", "我是左程云");
  		System.out.println(map.containsKey("zuochengyun"));
  		System.out.println(map.containsKey("zuo"));
  		System.out.println(map.get("zuochengyun"));
  
  		map.put("zuochengyun", "他是左程云");
  		System.out.println(map.get("zuochengyun"));
  
  //		map.remove("zuochengyun");
  //		System.out.println(map.containsKey("zuochengyun"));
  //		System.out.println(map.get("zuochengyun"));
  
  		String test1 = "zuochengyun";
  		String test2 = "zuochengyun";
  		System.out.println(map.containsKey(test1));
  		System.out.println(map.containsKey(test2));
  
  		HashMap<Integer, String> map2 = new HashMap<>();
  		map2.put(1234567, "我是1234567");
  
  		Integer a = 1234567;
  		Integer b = 1234567;
  
  		System.out.println(a == b);
  		System.out.println(map2.containsKey(a));
  		System.out.println(map2.containsKey(b));
  
  		Node node1 = new Node(1);
  		Node node2 = new Node(1);
  		HashMap<Node, String> map3 = new HashMap<>();
  		map3.put(node1, "我进来了！");
  		System.out.println(map3.containsKey(node1));
  		System.out.println(map3.containsKey(node2));
  
  		System.out.println("===================");
  
  		TreeMap<Integer, String> treeMap1 = new TreeMap<>();
  
  		treeMap1.put(3, "我是3");
  		treeMap1.put(0, "我是3");
  		treeMap1.put(7, "我是3");
  		treeMap1.put(2, "我是3");
  		treeMap1.put(5, "我是3");
  		treeMap1.put(9, "我是3");
  
  		System.out.println(treeMap1.containsKey(7));
  		System.out.println(treeMap1.containsKey(6));
  		System.out.println(treeMap1.get(3));
  
  		treeMap1.put(3, "他是3");
  		System.out.println(treeMap1.get(3));
  
  		treeMap1.remove(3);
  		System.out.println(treeMap1.get(3));
  
  		System.out.println(treeMap1.firstKey());
  		System.out.println(treeMap1.lastKey());
  		// <=5 离5最近的key告诉我
  		System.out.println(treeMap1.floorKey(5));
  		// <=6 离6最近的key告诉我
  		System.out.println(treeMap1.floorKey(6));
  		// >=5 离5最近的key告诉我
  		System.out.println(treeMap1.ceilingKey(5));
  		// >=6 离6最近的key告诉我
  		System.out.println(treeMap1.ceilingKey(6));
  
  //		Node node3 = new Node(3);
  //		Node node4 = new Node(4);
  //		TreeMap<Node, String> treeMap2 = new TreeMap<>();
  //		treeMap2.put(node3, "我是node3");
  //		treeMap2.put(node4, "我是node4");
  
  	}
  
  }
  