Java LongBuffer limit()用法及代码示例

java.nio.LongBuffer类的limit()方法用于修改此LongBuffer的限制。此方法将要设置的限制作为参数，并将其设置为此Buffer的新限制。如果此缓冲区的标记已经定义并且大于新指定的限制，则不会设置并丢弃此新限制。

用法:

public final LongBuffer limit(int newLimit)

参数：该方法采用整数类型的一个参数newLimit，该参数表示要设置为缓冲区的新限制的限制。

返回值：在将指定的新限制设置为该缓冲区的新限制之后，此方法将返回此缓冲区。

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 LongBuffer 
        // using allocate() method 
        LongBuffer longBuffer 
            = LongBuffer.allocate(4); 
  
        // put long value in longBuffer 
        // using put() method 
        longBuffer.put(20); 
        longBuffer.put(30); 
  
        // print the long buffer 
        System.out.println( 
            "LongBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
  
        // Limit the longBuffer 
        // using limit() method 
        longBuffer.limit(1); 
  
        // print the long buffer 
        System.out.println( 
            "\nLongBuffer after "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
    } 
}

输出：

LongBuffer before setting buffer's limit: [20, 30, 0, 0]
Position: 2
Limit: 4

LongBuffer after setting buffer's limit: [20, 30, 0, 0]
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 LongBuffer 
        // using allocate() method 
        LongBuffer longBuffer 
            = LongBuffer.allocate(5); 
  
        // put double value in LongBuffer 
        // using put() method 
        longBuffer.put(20); 
        longBuffer.put(30); 
        longBuffer.put(40); 
  
        // mark will be going to 
        // discarded by limit() 
        longBuffer.mark(); 
  
        // print the long buffer 
        System.out.println( 
            "LongBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
  
        // Limit the longBuffer 
        // using limit() method 
        longBuffer.limit(4); 
  
        // print the long buffer 
        System.out.println( 
            "\nLongBuffer before "
            + "setting buffer's limit: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
    } 
}

输出：

LongBuffer before setting buffer's limit: [20, 30, 40, 0, 0]
Position: 3
Limit: 5

LongBuffer before setting buffer's limit: [20, 30, 40, 0, 0]
Position: 3
Limit: 4

参考：https://docs.oracle.com/javase/9/docs/api/java/nio/LongBuffer.html#rewind–

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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 LongBuffer limit() method 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。