Java 中的 NavigableMap pollFirstEntry() 方法
pollFirstEntry()NavigableMap中的方法移除并返回与此映射中最小键关联的键值映射
下面是一个实现pollFirstEntry()方法的例子
示例
import java.util.*;
public class Demo {
public static void main(String[] args) {
NavigableMap n = new TreeMap();
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("\nRemoved (first) key-value is "+n.pollFirstEntry());
System.out.println("\nUpdated NavigableMap elements...\n"+n);
}
} 输出结果NavigableMap elements...
{1=Tim, 4=Jackie, 5=Tom, 9=John, 14=Jamie, 15=Kurt, 19=Tiger, 24=Jacob}
Removed (first) key-value is 1=Tim
Updated NavigableMap elements...
{4=Jackie, 5=Tom, 9=John, 14=Jamie, 15=Kurt, 19=Tiger, 24=Jacob}