📜  Java String trim() 方法与示例

📅  最后修改于: 2022-05-13 01:55:27.117000             🧑  作者: Mango

Java String trim() 方法与示例

Java String 中的trim()方法是一个内置函数,可以消除前导和尾随空格。空格字符的 Unicode 值为 '\u0020'。 Java中的 trim() 方法检查字符串前后的 Unicode 值,如果存在则删除空格并返回省略的字符串。 trim() 方法还有助于修剪Java中的字符。

方法签名:

public String trim()

参数: trim() 方法不接受任何参数。

返回类型: trim() 方法的返回类型是String 。它返回没有前导和尾随空格的省略字符串。

下面的示例展示了Java中字符串trim()方法的工作原理。

示例 1:

Java
// Java program to demonstrate working
// of java string trim() method
 
class Gfg {
 
    // driver code
    public static void main(String args[])
    {
 
        // trims the trailing and leading spaces
        String s = " geeks for geeks has all java functions to read  ";
        System.out.println(s.trim());
 
        // trims the leading spaces
        s = " Chetna loves reading books";
        System.out.println(s.trim());
    }
}


Java
// Java program to demonstrate working
// of java string trim() method
 
import java.io.*;
 
class GFG {
    public static void main (String[] args) {
         
      String s1 = "   Geeks For Geeks   ";
       
      // Before Trim() method
      System.out.println("Before Trim() - ");
      System.out.println("String - "+s1);
      System.out.println("Length - "+s1.length());
       
      // applying trim() method on string s1
      s1=s1.trim();
       
      // After Trim() method
      System.out.println("\nAfter Trim() - ");
      System.out.println("String - "+s1);
      System.out.println("Length - "+s1.length());
       
    }
}


输出
geeks for geeks has all java functions to read
Chetna loves reading books

示例 2:

Java

// Java program to demonstrate working
// of java string trim() method
 
import java.io.*;
 
class GFG {
    public static void main (String[] args) {
         
      String s1 = "   Geeks For Geeks   ";
       
      // Before Trim() method
      System.out.println("Before Trim() - ");
      System.out.println("String - "+s1);
      System.out.println("Length - "+s1.length());
       
      // applying trim() method on string s1
      s1=s1.trim();
       
      // After Trim() method
      System.out.println("\nAfter Trim() - ");
      System.out.println("String - "+s1);
      System.out.println("Length - "+s1.length());
       
    }
}
输出
Before Trim() - 
String -    Geeks For Geeks   
Length - 21

After Trim() - 
String - Geeks For Geeks
Length - 15