Java StringBuilder length() 方法

2024年12月24日 | 阅读 1 分钟

Java StringBuilder 类的length() 方法返回此序列的长度（总字符数）。

语法

参数

不适用

返回值

length() 方法返回此序列的总字符数。

Exception

不适用

兼容版本

Java 1.5 及以上版本

示例 1

public class StringBuilderLengthExample1 {
	public static void main(String[] args) {
		StringBuilder sb1= new StringBuilder("javatpoint");
		
		// return the length of string
		int length1 = sb1.length();
		System.out.println("total character count of \"javatpoint\"= " + length1);
		
		StringBuilder sb2 = new StringBuilder("string l e ng th");
		// return the length of string
		int length2 = sb2.length();
		System.out.println("total character count of \"string l e ng th\"= " + length2);
		
		sb2 = new StringBuilder("");
		//return the length of empty string
		System.out.println("total character count = " + sb2.length());
	}
}

输出

total character count of "javatpoint"= 10
total character count of "string l e ng th"= 16
total character count = 0

示例 2

在此示例中，我们通过从用户获取输入来计算字符串的长度。

public class StringBuilderLengthExample2 {
	public static void main(String[] args) {
		StringBuilder sb = new StringBuilder("");
		 System.out.print("enter your string value: ");
		 Scanner sc = new Scanner(System.in);
		 sb.append(sc.nextLine());
		 //returning total input character
		 System.out.println("total input character : "+sb.length());
		 sc.close();
	}
}

输出

enter your string value: hello this is a string
total input character : 22

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