Java 中枚举 hasMoreElements()方法，带示例
原文:https://www . geesforgeks . org/enumeration-hasmorelements-method-in-Java-with-examples/
实现枚举接口的对象生成一系列元素，一次一个。hasmorelements()枚举的方法，用于测试该枚举是否包含更多元素。如果枚举包含更多元素，那么它将返回 true 否则返回 false。
语法:
boolean hasMoreElements()
参数:此方法不接受任何内容。
返回值:当且仅当此枚举对象至少包含一个要提供的元素时，此方法返回 true 否则为假。
下面的程序说明了 hasMoreElements()方法: 程序 1:
// Java program to demonstrate
// Enumeration.hasMoreElements() method
import java.util.*;
public class GFG {
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void main(String[] args)
{
Enumeration Days;
Vector week = new Vector();
week.add("Sunday");
week.add("Monday");
week.add("Tuesday");
week.add("Wednesday");
week.add("Thursday");
week.add("Friday");
week.add("Saturday");
Days = week.elements();
while (Days.hasMoreElements()) {
System.out.println("Day = "
+ Days.nextElement());
}
}
}
Output:
Day = Sunday
Day = Monday
Day = Tuesday
Day = Wednesday
Day = Thursday
Day = Friday
Day = Saturday
程序 2:
// Java program to demonstrate
// Enumeration.hasMoreElements() method
import java.util.*;
public class GFG {
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void main(String[] args)
{
Enumeration<Integer> classNine;
Vector<Integer> rollno = new Vector<Integer>();
rollno.add(1);
rollno.add(2);
rollno.add(3);
rollno.add(4);
rollno.add(5);
rollno.add(6);
rollno.add(7);
rollno.add(8);
classNine = rollno.elements();
while (classNine.hasMoreElements()) {
System.out.println("Roll No = "
+ classNine.nextElement());
}
}
}
Output:
Roll No = 1
Roll No = 2
Roll No = 3
Roll No = 4
Roll No = 5
Roll No = 6
Roll No = 7
Roll No = 8
参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/util/enumeration . html # hasmorelements()
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