Java CharBuffer limit()用法及代码示例

java.nio.CharBuffer类的limit()方法用于设置此缓冲区的限制。如果位置大于新限制，则将其设置为新限制。如果标记已定义且大于新限制，则将其丢弃。

用法:

public CharBuffer limit(int newLimit)

返回值：此方法返回此缓冲区。

下面是说明limit()方法的示例：

范例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()); 
    } 
}

输出：

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

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

范例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()); 
    } 
}

输出：

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

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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 CharBuffer limit() methods in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。