java Java 中的 CharBuffer limit()方法，示例

Java 中的 CharBuffer limit()方法，示例

原文:https://www . geesforgeks . org/char buffer-limit-methods-in-Java-with-examples/

java.nio.CharBuffer 类的限制()方法用于设置该缓冲区的限制。如果该位置大于新限制，则将其设置为新限制。如果标记已定义并且大于新的限制，则丢弃该标记。

语法:

public CharBuffer limit(int newLimit)

返回值:这个方法返回这个缓冲区。

以下是举例说明 limit()方法的示例:

示例 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 CharBuffer
        // using allocate() method
        CharBuffer charBuffer = CharBuffer.allocate(4);

        // append char value in CharBuffer
        // using char() method
        charBuffer.append('a');
        charBuffer.append('b');

        // print the char buffer
        System.out.println("CharBuffer before "
                           + "setting buffer's limit: "
                           + Arrays.toString(
                                 charBuffer.array())
                           + "\nPosition: "
                           + charBuffer.position()
                           + "\nLimit: "
                           + charBuffer.limit());

        // Limit the CharBuffer
        // using limit() method
        charBuffer.limit(1);

        // print the char buffer
        System.out.println("CharBuffer before "
                           + "setting buffer's limit: "
                           + Arrays.toString(
                                 charBuffer.array())
                           + "\nPosition: "
                           + charBuffer.position()
                           + "\nLimit: "
                           + charBuffer.limit());
    }
}

输出:

CharBuffer before setting buffer's limit: [a, b,,  ]
Position: 2
Limit: 4

CharBuffer after setting buffer's limit: [a, b,,  ]
Position: 1
Limit: 1

示例 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 CharBuffer
        // using allocate() method
        CharBuffer charBuffer
            = CharBuffer.allocate(5);

        // append char value in CharBuffer
        // using char() method
        charBuffer.append('a');
        charBuffer.append('b');
        charBuffer.append('c');

        // mark will be going to discarded by limit()
        charBuffer.mark();

        // print the char buffer
        System.out.println("CharBuffer before "
                           + "setting buffer's limit: "
                           + Arrays.toString(
                                 charBuffer.array())
                           + "\nPosition: "
                           + charBuffer.position()
                           + "\nLimit: "
                           + charBuffer.limit());

        // Limit the charBuffer
        // using limit() method
        charBuffer.limit(4);

        // print the char buffer
        System.out.println("CharBuffer before "
                           + "setting buffer's limit: "
                           + Arrays.toString(
                                 charBuffer.array())
                           + "\nPosition: "
                           + charBuffer.position()
                           + "\nLimit: "
                           + charBuffer.limit());
    }
}

输出:

CharBuffer before setting buffer's limit: [a, b, c,,  ]
Position: 3
Limit: 5

CharBuffer after setting buffer's limit: [a, b, c,,  ]
Position: 3
Limit: 4