[1일1코딩] [Java] Collection - Map - TreeMap

 

put(K key, V value):V

size():int

remove(Object key):V

remove(Object key, Object value):boolean

replace(K key, V value):default V

replace(K key, V oldValue, V newValue):boolean

 

 

 

 

 

 

 

// TreeMap
		//
		
		System.out.println("=====TreeMap=====");
//		TreeMap<String,pModelVo03> tm = new TreeMap<>();
		TreeMap<String,pModelVo03> tm = new TreeMap<>(hm);
		System.out.println(tm); // {내=으샤으샤[2원], 라=으랴차차[3원], 힘=아자아자[1원]}
		
		// size():int
		System.out.println(tm.size()); // 3
		
		// remove(Object key):V
//		System.out.println(tm.remove(new TreeMap("힘"), new TreeMap("아자아자",1)));
		System.out.println(tm.remove(new String("힘"))); // value리턴 : 아자아자[1원]
		System.out.println(tm); // {내=으샤으샤[2원], 라=으랴차차[3원]}
		
		System.out.println(tm.keySet());
		Set<String> set = tm.keySet(); 
		Iterator<String> itr = set.iterator();
		while(itr.hasNext()) {
			String str = itr.next();
			System.out.println(str);
		}
		System.out.println(tm.remove(new String("내")));
		System.out.println(tm); // {라=으랴차차[3원]}
		
		
		System.out.println("===replace===");
		// replace(K key, V oldValue, V newValue):boolean
		System.out.println(tm.replace(new String("라"), new pModelVo03("으랴차차",3), new pModelVo03("화이팅",4)));//true
		
		// remove(Object key, Object value):boolean
		tm.remove(new String("라"), new pModelVo03("화이팅",4));
		System.out.println(tm); // {}
		
		System.out.println("===TreeMap2===");
		TreeMap<String,pModelVo03> tm2 = new TreeMap<>();
		
		// put(K key, V value):V
		tm2.put(new String("a"), new pModelVo03("a",1));
		tm2.put(new String("b"),new pModelVo03("b",2));
		tm2.put(new String("c"),new pModelVo03("c",3));
		System.out.println(tm2); //  {a=a[1원], b=b[2원], c=c[3원]}
		
		// size():int
		System.out.println(tm2.size()); // 2
		// remove(Object key):V
		System.out.println(tm2.remove(new String("b"))); // 지운 밸류값 출력 : b[2원]
		System.out.println(tm2);						 // {a=a[1원], c=c[3원]}
		// remove(Object key, Object value):boolean
		System.out.println(tm2.remove(new String("a"),new pModelVo03("a",1)));// true
		System.out.println(tm2);						 // {c=c[3원]}
		// replace(K key, V value):default V
		System.out.println(tm2.replace(new String("c"), new pModelVo03("c",3))); // c[3원]
		// replace(K key, V oldValue, V newValue):boolean
		tm2.replace(new String("c"), new pModelVo03("c",3), new pModelVo03("d",4));
		System.out.println(tm2.replace(new String("c"), new pModelVo03("c",3), new pModelVo03("d",4)));//false
		System.out.println(tm2); // {c=d[4원]} : 키값c 밸류값d,4