Java ShortBuffer limit()方法及示例
java.nio.ShortBuffer类的 limit() 方法是用来修改这个ShortBuffer的极限。这个方法把要设置的极限作为参数,并把它作为这个Buffer的新极限。如果这个Buffer的标记已经被定义,并且大于新指定的极限,那么这个新的极限就不会被设置并被丢弃。
语法
public final ShortBuffer limit(int newLimit)
参数。这个方法接受一个参数 newLimit ,它是极限的新整数值。
返回值: 该方法将指定的新极限作为该缓冲区的新极限后返回该 缓冲区 。
下面是limit()方法的例子。
例子 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 ShortBuffer
// using allocate() method
ShortBuffer shortBuffer
= ShortBuffer.allocate(4);
// put short value in ShortBuffer
// using put() method
shortBuffer.put((short)20);
shortBuffer.put((short)30);
// print the short buffer
System.out.println(
"ShortBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
shortBuffer.array())
+ "\nPosition: "
+ shortBuffer.position()
+ "\nLimit: "
+ shortBuffer.limit());
// Limit the shortBuffer
// using limit() method
shortBuffer.limit(1);
// print the short buffer
System.out.println(
"\nShortBuffer after "
+ "setting buffer's limit: "
+ Arrays.toString(
shortBuffer.array())
+ "\nPosition: "
+ shortBuffer.position()
+ "\nLimit: "
+ shortBuffer.limit());
}
}
输出:
ShortBuffer before setting buffer's limit: [20, 30, 0, 0]
Position: 2
Limit: 4
ShortBuffer after setting buffer's limit: [20, 30, 0, 0]
Position: 1
Limit: 1
例子 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 ShortBuffer
// using allocate() method
ShortBuffer shortBuffer
= ShortBuffer.allocate(5);
// put short value in ShortBuffer
// using put() method
shortBuffer.put((short)20);
shortBuffer.put((short)30);
shortBuffer.put((short)40);
// mark will be going to
// discarded by limit()
shortBuffer.mark();
// print the short buffer
System.out.println(
"ShortBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
shortBuffer.array())
+ "\nPosition: "
+ shortBuffer.position()
+ "\nLimit: "
+ shortBuffer.limit());
// Limit the shortBuffer
// using limit() method
shortBuffer.limit(4);
// print the short buffer
System.out.println(
"\nShortBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
shortBuffer.array())
+ "\nPosition: "
+ shortBuffer.position()
+ "\nLimit: "
+ shortBuffer.limit());
}
}
输出:
ShortBuffer before setting buffer's limit: [20, 30, 40, 0, 0]
Position: 3
Limit: 5
ShortBuffer before setting buffer's limit: [20, 30, 40, 0, 0]
Position: 3
Limit: 4
参考资料: https://docs.oracle.com/javase/9/docs/api/java/nio/ShortBuffer.html#mark-