java.nio.IntBuffer类的mark()方法用于将该IntBuffer的当前位置标记为该缓冲区的标记。
用法:
public final IntBuffer mark()
参数:该方法不带任何参数。
返回值:在将缓冲区的标记设置在当前位置之后,此方法将返回此IntBuffer。
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 {
int[] farr = { 10, 20, 30, 40 };
// creating object of IntBuffer
// and allocating size capacity
IntBuffer ib = IntBuffer.wrap(farr);
// try to set the position at index 2
ib.position(2);
// Set this buffer mark position
// using mark() method
ib.mark();
// try to set the position at index 4
ib.position(4);
// display position
System.out.println("position before reset: "
+ ib.position());
// try to call reset() to restore
// to the position we marked
ib.reset();
// display position
System.out.println("position after reset: "
+ ib.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 {
int[] farr = { 10, 20, 30, 40 };
// creating object of IntBuffer
// and allocating size capacity
IntBuffer ib = IntBuffer.wrap(farr);
// try to set the position at index 2
ib.position(2);
// Set this buffer mark position
// using mark() method
ib.mark();
// try to set the position at index 1
ib.position(1);
// display position
System.out.println("position before reset: "
+ ib.position());
// try to call reset() to restore
// to the position we marked
ib.reset();
// display position
System.out.println("position after reset: "
+ ib.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/IntBuffer.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 IntBuffer 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。