Java示例打印集合 Java示例集合到数组 Java示例只读集合 Java示例打印集合 import java.util.*; public class TreeExample{ public static void main(String[] args) { System.out.println("Tree Map Example!\n"); TreeMap <Integer, String>tMap = new TreeMap<Integer, String>(); tMap.put(1, "Sunday"); tMap.put(2, "Monday"); tMap.put(3, "Tuesday"); tMap.put(4, "Wednesday"); tMap.put(5, "Thursday"); tMap.put(6, "Friday"); tMap.put(7, "Saturday"); System.out.println("Keys of tree map: " + tMap.keySet()); System.out.println("Values of tree map: " + tMap.values()); System.out.println("Key: 5 value: " + tMap.get(5)+ "\n"); System.out.println( "First key: " + tMap.firstKey() + " Value: " + tMap.get(tMap.firstKey()) + "\n"); System.out.println( "Last key: " + tMap.lastKey() + " Value: "+ tMap.get(tMap.lastKey()) + "\n"); System.out.println("Removing first data: " + tMap.remove(tMap.firstKey())); System.out.println("Now the tree map Keys: " + tMap.keySet()); System.out.println("Now the tree map contain: " + tMap.values() + "\n"); System.out.println("Removing last data: " + tMap.remove(tMap.lastKey())); System.out.println("Now the tree map Keys: " + tMap.keySet()); System.out.println("Now the tree map contain: " + tMap.values()); } } Java示例集合到数组 Java示例只读集合