将链接列表转换为 Java 中的字符串
原文:https://www . geesforgeks . org/convert-linked list-to-string-in-Java/
一个链接列表是一个线性数据结构，其中元素不存储在连续的存储位置。
为了将链表转换成字符串，我们需要遍历链表，然后，我们需要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 将链接列表转换为字符串。
对于追加字符串，我们可以对字符串类使用“+”运算符，对字符串缓冲区和字符串构建器使用追加方法。
例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// 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<Integer> 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<Integer> 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<Integer> listIterator
= list.listIterator();
while (listIterator.hasNext()) {
// using append method for appending string
stringBuilder.append(listIterator.next())
.append(" ");
}
// displaying output
System.out.println(stringBuilder);
}
}
Output
100 200 300 400
100 200 300 400
100 200 300 400
例 2:
在本例中，我们将使用用户定义的类
Java 语言(一种计算机语言，尤用于创建网站)
// 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<friendsDetail> 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<friendsDetail> 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<friendsDetail> 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);
}
}
Output
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
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