Java StringBuilder length()用法及代碼示例

StringBuilder類的length()方法返回StringBuilder對象包含的字符數。此方法返回當前由StringBuilder對象表示的字符序列的長度。

用法:

public int length()

返回值：此方法返回StringBuilder對象包含的字符序列的長度。

下麵的程序演示StringBuilder類的length()方法：

範例1：

// Java program to demonstrate 
// the length() 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()); 
  
        // get length of StringBuilder object 
        int length = str.length(); 
  
        // print length 
        System.out.println("length of String = "
                           + length); 
    } 
}

輸出：

String = WelcomeGeeks
length of String = 12

範例2：

// Java program to demonstrate 
// the length() Method. 
  
class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a StringBuilder object 
        // with a String pass as parameter 
        StringBuilder 
            str 
            = new StringBuilder("India is Great"); 
  
        // print string 
        System.out.println("String = "
                           + str.toString()); 
  
        // get length of StringBuilder object 
        int length = str.length(); 
  
        // print length 
        System.out.println("length of String = "
                           + length); 
    } 
}

輸出：

String = India is Great
length of String = 14

參考：
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#length()

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