Java 中的 Java.util.BitSet.clear()
原文:https://www.geeksforgeeks.org/java-util-bitset-clear-java/
清()法有三个变型:
-
clear() : The clear() method sets all of the bits in this BitSet to false.
```java public void clear() Return Value This method does not return a value.
```
```java // Java code to demonstrate the working // of clear() in BitSet import java.util.*; public class BitClr1 { public static void main(String[] args) {
// Declaring Bitset BitSet bset = new BitSet(8);
// assigning values to bitset for (int i = 0; i < 5; i++) bset.set(i);
// printing original bitset System.out.println ("The bitset before clear() operation is : " + bset);
// using clear() to clear contents of bitset bset.clear();
// printing bitset after clear() operation // empty bitset System.out.println ("The bitset after clear() operation is : " + bset); } } ```
输出:
```java The bitset before clear() operation is : {0, 1, 2, 3, 4} The bitset after clear() operation is : {}
```
-
clear(int pos) : The clear(int pos) method sets the bit specified by the index to false. i.e removes from bitset.
```java public void clear(int pos) Parameters pos : the index of the bit to be cleared. Return Value This method does not return a value. Exception IndexOutOfBoundsException : if the specified index is negative.
```
```java // Java code to demonstrate the working // of clear(int pos) in BitSet import java.util.*; public class BitClr2 { public static void main(String[] args) {
// Declaring Bitset BitSet bset = new BitSet(8);
// assigning values to bitset for (int i = 0; i < 5; i++) bset.set(i);
// printing original bitset System.out.println ("The bitset before clear(pos) operation is : " + bset);
// using clear(pos) to clear element at specified position bset.clear(3);
// printing bitset after clear(pos) operation // removes 3 System.out.println ("The bitset after clear(pos) operation is : " + bset); } } ```
输出:
```java The bitset before clear(pos) operation is : {0, 1, 2, 3, 4} The bitset after clear(pos) operation is : {0, 1, 2, 4}
```
-
clear(int frompos, int topos) : The clear(int frompos, int topos) method sets the bits from the specified frompos (inclusive) to the specified topos (exclusive) to false i.e performs removal in a range.
```java public void clear(int frompos, int topos) Parameters frompos : index of the first bit to be cleared topos : index of the last bit to be cleared Return Value This method does not return a value. Exception IndexOutOfBoundsException: if frompos is negative, or topos is negative, or frompos is larger than topos.
```
```java // Java code to demonstrate the working // of clear(int frompos, int topos) in BitSet import java.util.*; public class BitClr3 { public static void main(String[] args) {
// Declaring Bitset BitSet bset = new BitSet(8);
// assigning values to bitset for (int i = 0; i < 5; i++) bset.set(i);
// printing original bitset System.out.println ("The bitset before clear(frompos, topos) operation is : " + bset);
// using clear(frompos, topos) to clear elements in range bset.clear(2, 4);
// printing bitset after clear(frompos, topos) operation // removes 2, 3 System.out.println ("The bitset after clear(frompos, topos) operation is : " + bset); } } ```
输出:
```java The bitset before clear(frompos, topos) operation is : {0, 1, 2, 3, 4} The bitset after clear(frompos, topos) operation is : {0, 1, 4}
```
本文由 Astha Tyagi 供稿。如果你喜欢 GeeksforGeeks 并想投稿，你也可以使用contribute.geeksforgeeks.org写一篇文章或者把你的文章邮寄到 contribute@geeksforgeeks.org。看到你的文章出现在极客博客主页上，帮助其他极客。 如果你发现任何不正确的地方，或者你想分享更多关于上面讨论的话题的信息，请写评论。
版权属于：月萌API www.moonapi.com，转载请注明出处
