StringBuilder类的length()方法返回StringBuilder对象包含的字符数。此方法返回当前由StringBuilder对象表示的字符序列的长度。
用法:
public int length()
返回值:此方法返回StringBuilder对象包含的字符序列的长度。
下面的程序演示StringBuilder类的length()方法:
范例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);
}
}
输出:
String = WelcomeGeeks length of String = 12
范例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);
}
}
输出:
String = India is Great length of String = 14
参考:
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#length()
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