Java StringBuilder replace()用法及代码示例

StringBuilder类的replace(int start，int end，String str)方法用于用指定String中的字符替换此序列的子字符串中的字符。子字符串从指定的索引开头开始，并扩展到索引结尾– 1处的字符，或者扩展到序列末尾(如果不存在这样的字符)。首先，删除子字符串的字符，并插入作为参数传递的字符串来代替这些字符。
用法:

public StringBuilder replace?(int start, int end, String str)

参数：
此方法接受三个参数：

start–引用起始索引的整数类型值。
end–引用结束索引的整数类型值。
str–字符串类型值，该值引用将替换先前内容的字符串。

返回值：
成功替换字符后，此方法返回StringBuilder对象。
异常：
如果开始为负，大于length()，或者大于结束，则StringIndexOutOfBoundsException。

以下程序说明了java.lang.StringBuilder.replace()方法：
示例1:

// Java program to demonstrate 
// the replace() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder str 
            = new StringBuilder("WelcomeGeeks"); 
  
        // print string 
        System.out.println("String = "
                           + str.toString()); 
  
        // replace Character from index 1 to 7 by "e are " 
        StringBuilder strReturn = str.replace(1, 7, "e are "); 
  
        // print string 
        System.out.println("After Replace() String = "
                           + strReturn.toString()); 
    } 
}

输出：

String = WelcomeGeeks
After Replace() String = We are Geeks

示例2:

// Java program to demonstrate 
// the replace() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder str 
            = new StringBuilder("Tony Stark will die"); 
  
        // print string 
        System.out.println("String = "
                           + str.toString()); 
  
        // replace Character from index 15 to 16 by " not " 
        StringBuilder strReturn = str.replace(15, 16, " not "); 
  
        // print string 
        System.out.println("After Replace() String = "
                           + strReturn.toString()); 
    } 
}

输出：

String = Tony Stark will die
After Replace() String = Tony Stark will not die

示例3:传递负索引时：

// Java program to demonstrate 
// Exception thrown by the replace() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder str 
            = new StringBuilder("Tony Stark"); 
  
        try { 
            // replace Character from index -15 to 16 by "Captain America" 
            StringBuilder strReturn = str.replace(-15, 16, "Captain America"); 
        } 
        catch (Exception e) { 
  
            e.printStackTrace(); 
        } 
    } 
}

输出：

java.lang.StringIndexOutOfBoundsException: String index out of range: -15
    at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:851)
    at java.lang.StringBuilder.replace(StringBuilder.java:262)
    at GFG.main(File.java:17)

示例4:当传递的起始索引大于终止索引时：

// Java program to demonstrate 
// Exception thrown by the replace() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder str 
            = new StringBuilder("Tony Stark"); 
  
        try { 
            // replace Character from index 5 to 3 by "Captain America" 
            StringBuilder strReturn = str.replace(5, 3, "Captain America"); 
        } 
        catch (Exception e) { 
  
            e.printStackTrace(); 
        } 
    } 
}

输出：

java.lang.StringIndexOutOfBoundsException: start > end
    at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:855)
    at java.lang.StringBuilder.replace(StringBuilder.java:262)
    at GFG.main(File.java:17)

参考文献：
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#replace(int，int，java.lang.String)

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 StringBuilder replace() in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。