Java CharBuffer limit()用法及代碼示例

java.nio.CharBuffer類的limit()方法用於設置此緩衝區的限製。如果位置大於新限製，則將其設置為新限製。如果標記已定義且大於新限製，則將其丟棄。

用法:

public CharBuffer limit(int newLimit)

返回值：此方法返回此緩衝區。

下麵是說明limit()方法的示例：

範例1：

// Java program to demonstrate 
// limit() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating CharBuffer 
        // using allocate() method 
        CharBuffer charBuffer = CharBuffer.allocate(4); 
  
        // append char value in CharBuffer 
        // using char() method 
        charBuffer.append('a'); 
        charBuffer.append('b'); 
  
        // print the char buffer 
        System.out.println("CharBuffer before "
                           + "setting buffer's limit:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nPosition:"
                           + charBuffer.position() 
                           + "\nLimit:"
                           + charBuffer.limit()); 
  
        // Limit the CharBuffer 
        // using limit() method 
        charBuffer.limit(1); 
  
        // print the char buffer 
        System.out.println("CharBuffer before "
                           + "setting buffer's limit:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nPosition:"
                           + charBuffer.position() 
                           + "\nLimit:"
                           + charBuffer.limit()); 
    } 
}

輸出：

CharBuffer before setting buffer's limit:[a, b,,  ]
Position:2
Limit:4

CharBuffer after setting buffer's limit:[a, b,,  ]
Position:1
Limit:1

範例2：

// Java program to demonstrate 
// limit() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // defining and allocating CharBuffer 
        // using allocate() method 
        CharBuffer charBuffer 
            = CharBuffer.allocate(5); 
  
        // append char value in CharBuffer 
        // using char() method 
        charBuffer.append('a'); 
        charBuffer.append('b'); 
        charBuffer.append('c'); 
  
        // mark will be going to discarded by limit() 
        charBuffer.mark(); 
  
        // print the char buffer 
        System.out.println("CharBuffer before "
                           + "setting buffer's limit:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nPosition:"
                           + charBuffer.position() 
                           + "\nLimit:"
                           + charBuffer.limit()); 
  
        // Limit the charBuffer 
        // using limit() method 
        charBuffer.limit(4); 
  
        // print the char buffer 
        System.out.println("CharBuffer before "
                           + "setting buffer's limit:"
                           + Arrays.toString( 
                                 charBuffer.array()) 
                           + "\nPosition:"
                           + charBuffer.position() 
                           + "\nLimit:"
                           + charBuffer.limit()); 
    } 
}

輸出：

CharBuffer before setting buffer's limit:[a, b, c,,  ]
Position:3
Limit:5

CharBuffer after setting buffer's limit:[a, b, c,,  ]
Position:3
Limit:4

參考：https://docs.oracle.com/javase/9/docs/api/java/nio/CharBuffer.html#limit-int-

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 CharBuffer limit() methods in Java 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。