Java LongBuffer limit()用法及代碼示例

java.nio.LongBuffer類的limit()方法用於修改此LongBuffer的限製。此方法將要設置的限製作為參數，並將其設置為此Buffer的新限製。如果此緩衝區的標記已經定義並且大於新指定的限製，則不會設置並丟棄此新限製。

用法:

public final LongBuffer limit(int newLimit)

參數：該方法采用整數類型的一個參數newLimit，該參數表示要設置為緩衝區的新限製的限製。

返回值：在將指定的新限製設置為該緩衝區的新限製之後，此方法將返回此緩衝區。

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 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()); 
    } 
}

輸出：

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

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 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()); 
    } 
}

輸出：

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

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

相關用法

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