java.nio.LongBuffer类的mark()方法用于将LongBuffer的当前位置标记为该缓冲区的标记。
用法:
public LongBuffer mark()
参数:此方法不接受任何参数。
返回值:在将缓冲区的标记设置在当前位置之后,此方法返回此LongBuffer。
下面是说明mark()方法的示例:
范例1:
// Java program to demonstrate
// mark() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
long[] darr = { 10, 20, 30, 40 };
// creating object of LongBuffer
// and allocating size capacity
LongBuffer lb = LongBuffer.wrap(darr);
// try to set the position at index 2
lb.position(2);
// Set this buffer mark position
// using mark() method
lb.mark();
// try to set the position at index 4
lb.position(4);
// display position
System.out.println("position before reset: "
+ lb.position());
// try to call reset() to restore
// to the position we marked
lb.reset();
// display position
System.out.println("position after reset: "
+ lb.position());
}
catch (InvalidMarkException e) {
System.out.println("New position "
+ "is less than "
+ "the position "
+ "marked before ");
System.out.println("Exception throws: "
+ e);
}
}
}
输出:
position before reset: 4 position after reset: 2
范例2:演示InvalidMarkException
// Java program to demonstrate
// mark() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
long[] darr = { 10, 20, 30, 40 };
// creating object of LongBuffer
// and allocating size capacity
LongBuffer db = LongBuffer.wrap(darr);
// try to set the position at index 2
db.position(2);
// Set this buffer mark position
// using mark() method
db.mark();
// try to set the position at index 1
db.position(1);
// display position
System.out.println("position before reset: "
+ db.position());
// try to call reset() to restore
// to the position we marked
db.reset();
// display position
System.out.println("position after reset: "
+ db.position());
}
catch (InvalidMarkException e) {
System.out.println("\nNew position "
+ "is less than "
+ "the position "
+ "marked before ");
System.out.println("Exception throws: "
+ e);
}
}
}
输出:
position before reset: 1 New position is less than the position marked before Exception throws: java.nio.InvalidMarkException
参考: https://docs.oracle.com/javase/9/docs/api/java/nio/LongBuffer.html#mark–
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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 mark() 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。