Java 中的 FloatBuffer limit()方法,带示例
原文:https://www . geeksforgeeks . org/float buffer-limit-in-Java-method-with-examples/
java.nio.FloatBuffer 类的 limit() 方法用于修改该 FloatBuffer 的限制。此方法将待设置的限制作为参数,并将其设置为此缓冲区的新限制。如果此缓冲区的标记已经定义,并且大于新的指定限制,则不会设置和丢弃此新限制。
语法:
public final FloatBuffer limit(int *newLimit*)
参数:该方法取整数型的一个参数新极限,该参数是指要设置为缓冲区新极限的极限。
返回值:该方法将指定的新限制设置为该缓冲区的新限制后,返回该缓冲区。
以下示例说明了 limit()方法:
实施例 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 FloatBuffer
// using allocate() method
FloatBuffer floatBuffer
= FloatBuffer.allocate(4);
// put float value in FloatBuffer
// using put() method
floatBuffer.put(20.5f);
floatBuffer.put(30.5f);
// print the float buffer
System.out.println(
"FloatBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
floatBuffer.array())
+ "\nPosition: "
+ floatBuffer.position()
+ "\nLimit: "
+ floatBuffer.limit());
// Limit the floatBuffer
// using limit() method
floatBuffer.limit(1);
// print the float buffer
System.out.println(
"\nFloatBuffer after "
+ "setting buffer's limit: "
+ Arrays.toString(
floatBuffer.array())
+ "\nPosition: "
+ floatBuffer.position()
+ "\nLimit: "
+ floatBuffer.limit());
}
}
Output:
设置缓冲器极限前的浮动缓冲器: 【20.5,30.5,0.0,0.0】 位置:2 极限:4
设置缓冲器极限后的浮动缓冲器: 【20.5,30.5,0.0,0.0】 位置:1 极限:1
实施例 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 FloatBuffer
// using allocate() method
FloatBuffer floatBuffer
= FloatBuffer.allocate(5);
// put float value in FloatBuffer
// using put() method
floatBuffer.put(20.5f);
floatBuffer.put(30.5f);
floatBuffer.put(40.5f);
// mark will be going to
// discarded by limit()
floatBuffer.mark();
// print the float buffer
System.out.println(
"FloatBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
floatBuffer.array())
+ "\nPosition: "
+ floatBuffer.position()
+ "\nLimit: "
+ floatBuffer.limit());
// Limit the floatBuffer
// using limit() method
floatBuffer.limit(4);
// print the double buffer
System.out.println(
"\nFloatBuffer before "
+ "setting buffer's limit: "
+ Arrays.toString(
floatBuffer.array())
+ "\nPosition: "
+ floatBuffer.position()
+ "\nLimit: "
+ floatBuffer.limit());
}
}
Output:
设置缓冲器极限前的浮动缓冲器: 【20.5,30.5,40.5,0.0,0.0】 位置:3 极限:5
设置缓冲器极限前的浮动缓冲器: 【20.5,30.5,40.5,0.0,0.0】 位置:3 极限:4
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/float buffer . html # limit-int-
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