Java ListIterator previousIndex() 方法

2025 年 3 月 22 日 | 阅读需 2 分钟

ListIterator 接口的 previousIndex() 方法用于返回由 previous() 调用返回的给定元素的索引。如果迭代器位于列表的开头，则该方法可能返回 -1。

语法

参数

不适用

上述方法用于返回由 previous() 调用返回的给定元素的索引。如果迭代器位于列表的开头，则该方法可能返回 -1。

示例 1

import java.util.ArrayList;
import java.util.ArrayList;
import java.util.ListIterator;
public class JavaListIteratorpreviousIndexExample1 {
   public static void main(String[] args) {
	   ArrayList < Character > characters = new ArrayList < Character > ();
   	characters.add('R');
   	characters.add('E');
   	characters.add('A');
   	characters.add('L');
ListIterator < Character > listIterator = characters.listIterator();
System.out.println("The letters are listed as : "+characters);
       System.out.println("The Previous Index is : " + listIterator.previousIndex());
       listIterator.next();   
       System.out.println("The Previous Index is : " + listIterator.previousIndex());
       listIterator.next();
       System.out.println("The Next Index is : " + listIterator.previousIndex());
       listIterator.next();
       System.out.println("The Next index is : " + listIterator.previousIndex());     
   }
}

输出

The letters are listed as : [R, E, A, L]
The Previous Index is : -1
The Previous Index is : 0
The Next Index is : 1
The Next index is : 2

示例 2

import java.util.ArrayList;
import java.util.ListIterator;
public class JavaListIteratorpreviousIndexExample2 {
  public static void main(String[] args) {
	  ArrayList < Long > number = new ArrayList < Long > ();
          number.add(34l);
          number.add(78l);
          number.add(57l);
	ListIterator < Long > listIterator = number.listIterator();
	System.out.println("The numbers are listed as : "+number);
	       System.out.println("The Previous Index is : " + listIterator.previousIndex());
	       listIterator.next();   
	       System.out.println("The Previous Index is : " + listIterator.previousIndex());
	       listIterator.next();
	       System.out.println("The Next Index is : " + listIterator.previousIndex());
  }
}

输出

The numbers are listed as : [34, 78, 57]
The Previous Index is : -1
The Previous Index is : 0
The Next Index is : 1

下一主题Java ListIterator

Java ListIterator previousIndex() 方法

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示例 1

示例 2

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Java ListIterator previousIndex() 方法

语法

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返回

示例 1

示例 2

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