Java中的字符串连接操作方式示例

原创本是古典何须时尚 2024-11-23 14:27 8阅读 0赞

在Java中，字符串连接主要有以下几种方式：

1. 使用+号拼接：
```java
String str1 = "Hello";
String str2 = "World!";
String concatenatedStr = str1 + " " + str2;
System.out.println(concatenatedStr);  // Output: Hello World!
```

2. 使用`String.join()`方法：
```java
import java.util.Arrays;

public class StringJoinExample {
    public static void main(String[] args) {
        String[] words = {"Hello", "World!"};
        
        // Using separator (in this case, space)
        String concatenatedStr1 = String.join(" ", words);
        System.out.println(concatenatedStr1);  // Output: Hello World!

// Using a delimiter (in this case, comma and semicolon)
        String concatenatedStr2 = String.join(",; ", Arrays.asList(words[0], words[1]))).replaceAll("\\s+", "");
        System.out.println(concatenatedStr2);  // Output: Hello,World!
    }
}
```

3. 使用`StringBuilder`或`StringBuffer`：
```java
import java.util.Arrays;
import java.util.StringJoiner;

public class StringBuilderExample {
    public static void main(String[] args) {
        String[] words = {"Hello", "World!"};

// Using StringBuilder
        StringBuilder sbBuilder = new StringBuilder();
        for (String word : words) {
            sbBuilder.append(word).append(" ");
        }
        String concatenatedStrBuilder = sbBuilder.toString().trim();  // Trim to remove leading/trailing spaces
        System.out.println(concatenatedStrBuilder));  // Output: Hello World!

// Using StringJoiner
        StringJoiner joiner = new StringJoiner(",;", " "), words[0], words[1]);
        String concatenatedStrJoiner = joiner.toString().trim();  // Trim to remove leading/trailing spaces
        System.out.println(concatenatedStrJoiner));  // Output: Hello,World!
    }
}
```

以上示例展示了Java中几种常用的字符串连接方法。