Java中将 LinkedList 转换为 String

LinkedList 是一种线性数据结构，其中元素不存储在连续的内存位置。

要将链表转换为字符串，我们需要遍历链表，然后将链表的元素附加到字符串变量中。

我们可以使用 String 类、 StringBuilder或StringBuffer将 LinkedList 转换为字符串。

对于附加字符串，我们可以对 String 类使用“+”运算符，对 StringBuffer 和 StringBuilder 使用 append 方法。

示例 1：

Java

// Java program to Convert LinkedList to String in Java
 
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;
 
class GFG {
    public static void main(String[] args)
    {
 
        // creating a linkedlist
        LinkedList list = new LinkedList<>();
 
        // adding elements to linkedlist
        list.add(100);
        list.add(200);
        list.add(300);
        list.add(400);
 
        // By using String Class
        String s = "";
 
        // using iterator for traversing a linkedllist
        Iterator iterator = list.iterator();
 
        while (iterator.hasNext()) {
            // appending using "+" operator
            s = s + iterator.next() + " ";
        }
 
        // Displaying output
        System.out.println(s);
 
        // By using String Buffer
        StringBuffer stringBuffer = new StringBuffer();
 
        // using enhanced for loop for traversing a
        // linkedlist
        for (Integer integer : list) {
           
            // using append method for appending string
            stringBuffer.append(integer).append(" ");
        }
 
        // displaying output
        System.out.println(stringBuffer);
 
        // By using String Builder
        StringBuilder stringBuilder = new StringBuilder();
 
        // using ListIterator for traversing a linked list
        ListIterator listIterator
            = list.listIterator();
 
        while (listIterator.hasNext()) {
           
            // using append method for appending string
            stringBuilder.append(listIterator.next())
                .append(" ");
        }
 
        // displaying output
        System.out.println(stringBuilder);
    }
}

输出

100 200 300 400 
100 200 300 400 
100 200 300 400 

示例 2：

在这个例子中，我们将使用一个用户定义的类

Java

// Java program to Convert LinkedList to String in Java
 
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ListIterator;
 
class friendsDetail {
 
    // class field
    private String name;
    private String nickName;
    private int id;
 
    // parameterised constructor
    public friendsDetail(String name, String nickName,
                         int id)
    {
        this.name = name;
        this.nickName = nickName;
        this.id = id;
    }
 
    // getter for name
    public String getName() { return name; }
 
    // setter for name
    public void setName(String name) { this.name = name; }
 
    // getter for marks
    public int getID() { return id; }
 
    // setter for marks
    public void setID(int id) { this.id = id; }
 
    // getter for nickname
    public String getNickName() { return nickName; }
 
    // setter for nickname
    public void setNickName(String nickName)
    {
        this.nickName = nickName;
    }
 
    //@Override toString method
    public String toString()
    {
        return "name='" + name + '\'' + ", nickName='"
            + nickName + '\'' + ", ID=" + id;
    }
}
 
class Main {
    public static void main(String[] args)
    {
 
        LinkedList list = new LinkedList<>();
 
        // adding elements to linked list
        list.add(
            new friendsDetail("Ridhi", "Goda", 202199));
        list.add(
            new friendsDetail("Ananya", "Natki", 202195));
        list.add(new friendsDetail("Ankit", "Chota Don",
                                   202192));
        list.add(
            new friendsDetail("Suraj", "Bhindi", 202147));
        list.add(
            new friendsDetail("Sarthak", "Nagin", 202178));
        list.add(new friendsDetail("Sonika", "Chipkali",
                                   202167));
        list.add(new friendsDetail("Shishya", "Gorilla",
                                   202157));
 
        System.out.println("Using String Class\n");
 
        // using string class
        String s = "";
 
        // using iterator for traversing a linked list
        Iterator itr = list.iterator();
 
        while (itr.hasNext()) {
            // appending atring using "+" operator
            s = s + itr.next() + "\n";
        }
 
        // Displaying output
        System.out.println(s);
 
        System.out.println("\nUsing String Buffer\n");
 
        // using string buffer
        StringBuffer stringBuffer = new StringBuffer();
 
        // using enhanced for loop for linked list traversal
        for (friendsDetail friendmarks : list) {
            // using append method for appending
            stringBuffer.append(friendmarks).append("\n");
        }
 
        // displaying output
        System.out.println(stringBuffer);
 
        // using string builder
        System.out.println("\nUsing String Builder\n");
 
        // using list iterator for traversing a linked list
        ListIterator itr2
            = list.listIterator();
 
        StringBuilder stringBuilder = new StringBuilder();
 
        while (itr2.hasNext()) {
            // using append method for appending
            stringBuilder.append(itr2.next()).append("\n");
        }
 
        // displaying output
        System.out.println(stringBuilder);
    }
}

输出

Using String Class

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157


Using String Buffer

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157


Using String Builder

name='Ridhi', nickName='Goda', ID=202199
name='Ananya', nickName='Natki', ID=202195
name='Ankit', nickName='Chota Don', ID=202192
name='Suraj', nickName='Bhindi', ID=202147
name='Sarthak', nickName='Nagin', ID=202178
name='Sonika', nickName='Chipkali', ID=202167
name='Shishya', nickName='Gorilla', ID=202157