Java读取输入字符串的方法有多种:标准输入流System.inScanner类BufferedReader类
Java 读取输入的字符串
方法
Java 提供多种方法来从用户读取字符串:
- 标准输入流
- Scanner 类
- BufferedReader 类
标准输入流
System.in 字段表示标准输入流。使用 nextLine() 方法可以读取一行文本:
import java.io.InputStreamReader; public class Main { public static void main(String[] args) { InputStreamReader reader = new InputStreamReader(System.in); String input = reader.readLine(); System.out.println(input); } }
Scanner 类
Scanner 类提供了更方便的方法来读取输入:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String input = scanner.nextLine(); System.out.println(input); } }
Scanner 类还支持读取其他数据类型,比如整数和浮点数。
BufferedReader 类
BufferedReader 类是一种底层读取器,提供了更高级别的功能:
import java.io.BufferedReader; import java.io.InputStreamReader; public class Main { public static void main(String[] args) { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String input = reader.readLine(); System.out.println(input); } }
readLine() 方法会读取整行文本,包括换行符。可以使用 trim() 方法删除开头的和结尾的空格。
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