Java String subSequence()用法及代碼示例

Java.lang.String.subSequence()是Java中的內置函數，該函數返回CharSequence。 CharSequence，它是此序列的子序列。子序列以指定索引處的char值開始，並以(end-1)處的char值結束。返回序列的長度(以字符為單位)為(end-start，因此，如果start == end，則返回一個空序列。

用法:

public CharSequence subSequence(int start, int end) 
參數：
start - This is the index from where the subsequence starts, it is inclusive.
end - This is the index where the subsequence ends, it is exclusive.

返回值：
它返回範圍為[start，end)的指定子序列。

錯誤和異常：
IndexOutOfBoundsException-如果start或end為負，end大於length()或start大於end，則拋出此錯誤。

程序1:顯示Java.lang.String.subSequence()函數的工作方式。

// Java program to demonstrate working 
// of Java.lang.String.subSequence() method 
import java.lang.Math; 
  
class Gfg { 
  
    // driver code 
    public static void main(String args[]) 
    { 
  
        String Str = "Welcome to geeksforgeeks"; 
  
        // prints the subsequence from 0-7, exclusive 7th index 
        System.out.print("Returns:"); 
        System.out.println(Str.subSequence(0, 7)); 
  
        System.out.print("Returns:"); 
        System.out.println(Str.subSequence(10, 24)); 
    } 
}

輸出：

Returns:Welcome
Returns: geeksforgeeks

程序2:當索引為負時顯示Java.lang.String.subSequence()函數的錯誤

// Java program to demonstrate error 
// of Java.lang.String.subSequence() method 
import java.lang.Math; 
  
class Gfg { 
  
    // driver code 
    public static void main(String args[]) 
    { 
  
        String Str = "Welcome to geeksforgeeks"; 
  
        // throws an error as index is negative 
        System.out.print("Returns:"); 
        System.out.println(Str.subSequence(-1, 7)); 
    } 
}

輸出：

Exception in thread "main" java.lang.StringIndexOutOfBoundsException:
String index out of range:-1
    at java.lang.String.substring(String.java:1960)
    at java.lang.String.subSequence(String.java:2003)
    at Gfg.main(File.java:15)

程序3:當索引超出範圍時顯示Java.lang.String.subSequence()函數的錯誤。

// Java program to demonstrate error 
// of Java.lang.String.subSequence() method 
import java.lang.Math; 
  
class Gfg { 
  
    // driver code 
    public static void main(String args[]) 
    { 
  
        String Str = "Welcome to geeksforgeeks"; 
  
        // throws an error as end is out of range 
        System.out.print("Returns:"); 
        System.out.println(Str.subSequence(10, 50)); 
    } 
}

輸出：

Exception in thread "main" java.lang.StringIndexOutOfBoundsException:
String index out of range:50
    at java.lang.String.substring(String.java:1963)
    at java.lang.String.subSequence(String.java:2003)
    at Gfg.main(File.java:16)

相關用法

注：本文由純淨天空篩選整理自ChetnaAgarwal大神的英文原創作品 Java String subSequence() method with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。