Java 中的 ShortBuffer reset()方法，示例
原文:https://www . geesforgeks . org/short buffer-reset-method-in-Java-with-examples/
java.nio.ShortBuffer 类的 reset() 方法用于将该缓冲区的位置重置到之前标记的位置。在此过程中，标记的值保持不变。
语法:
public final ShortBuffer reset()
参数:此方法不接受任何参数。
返回值:这个方法返回这个缓冲区。
以下是说明 reset()方法的示例:
示例 1:
// Java program to demonstrate
// reset() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
short[] carr = { 10, 20, 30, 40 };
// creating object of ShortBuffer
// and allocating size capacity
ShortBuffer cb = ShortBuffer.wrap(carr);
// try to set the position at index 2
cb.position(2);
// Set this buffer mark position
// using mark() method
cb.mark();
// try to set the position at index 4
cb.position(4);
// display position
System.out.println("position before reset: "
+ cb.position());
// try to call reset() to restore
// to the position we marked
cb.reset();
// display position
System.out.println("position after reset: "
+ cb.position());
}
catch (InvalidMarkException e) {
System.out.println("new position is less than "
+ "the position we"
+ " marked before ");
System.out.println("Exception throws: " + e);
}
}
}
输出:
position before reset: 4
position after reset: 2
示例 2:
// Java program to demonstrate
// reset() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
short[] carr = { 10, 20, 30, 40 };
// creating object of ShortBuffer
// and allocating size capacity
ShortBuffer cb = ShortBuffer.wrap(carr);
// try to set the position at index 2
cb.position(2);
// Set this buffer mark position
// using mark() method
cb.mark();
// try to set the position at index 4
cb.position(1);
// display position
System.out.println("position before reset: "
+ cb.position());
// try to call reset() to restore
// to the position we marked
cb.reset();
// display position
System.out.println("position after reset: "
+ cb.position());
}
catch (InvalidMarkException e) {
System.out.println("\nnew position is less than "
+ "the position we"
+ " marked before ");
System.out.println("Exception throws: " + e);
}
}
}
输出:
position before reset: 1
new position is less than the position we marked before
Exception throws: java.nio.InvalidMarkException
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/short buffer . html # reset–
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