使用该clear()
方法从Java中的NavigableMap中删除所有元素。
首先,让我们创建NavigableMap-
NavigableMap<Integer, String> n = new TreeMap<Integer, String>();
将元素添加到NavigableMap-
n.put(5, "Tom"); n.put(9, "John"); n.put(14, "Jamie"); n.put(1, "Tim"); n.put(4, "Jackie"); n.put(15, "Kurt"); n.put(19, "Tiger"); n.put(24, "Jacob");
删除所有元素-
n.clear();
以下是从Java NavigableMap中删除所有元素的示例-
import java.util.*; public class Demo { public static void main(String[] args) { NavigableMap<Integer, String> n = new TreeMap<Integer, String>(); n.put(5, "Tom"); n.put(9, "John"); n.put(14, "Jamie"); n.put(1, "Tim"); n.put(4, "Jackie"); n.put(15, "Kurt"); n.put(19, "Tiger"); n.put(24, "Jacob"); System.out.println("NavigableMap elements...\n"+n); System.out.println("Size = "+n.size()); //删除所有元素 n.clear(); System.out.println("\nUpdated NavigableMap elements = "+n); System.out.println("Size = "+n.size()); } }
输出结果
NavigableMap elements... {1=Tim, 4=Jackie, 5=Tom, 9=John, 14=Jamie, 15=Kurt, 19=Tiger, 24=Jacob} Size = 8 Updated NavigableMap elements = {} Size = 0