Java 中的 CharBuffer position()方法，示例
原文:https://www . geesforgeks . org/char buffer-position-methods-in-Java-with-examples/
java.nio.CharBuffer 类 的位置(int newPosition) 方法用于设置该缓冲区的位置。如果标记被定义并且比新位置大，则它被丢弃。
语法:
public CharBuffer position(int newPosition)
参数:该方法以新位置为参数，为新位置值。它必须是非负的，并且不大于电流限制。
返回值:这个方法返回这个缓冲区。
以下是说明位置()方法的例子:
示例 1:
// Java program to demonstrate
// position() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
char[] carr = { 'a', 'b', 'c', 'd' };
// creating object of CharBuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.wrap(carr);
// try to set the position at index 2
// using position() method
cb.position(2);
// Set this buffer mark position
cb.mark();
// try to set the position at index 4
// using position() method
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());
}
}
输出:
position before reset: 4
position after reset: 2
示例 2:
// Java program to demonstrate
// position() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// creating object of CharBuffer
// and allocating size capacity
CharBuffer cb = CharBuffer.allocate(4);
// try to set the position at index 1
// using position() method
cb.position(1);
// putting the value of CharBuffer
// using append() method
cb.append('x');
// try to set the position at index 3
// using position() method
cb.position(3);
// putting the value of CharBuffer
// using append() method
cb.append("y");
// display position
System.out.println("CharBuffer: "
+ Arrays.toString(cb.array()));
}
}
输出:
CharBuffer: [, x,, y]
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/charbuffer . html # position-int-
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