Java.util.Bitset 类|逻辑运算
原文:https://www . geesforgeks . org/logic-operations-Java-util-bitset/
Bitset 类还允许对两个 bitset 进行一些逻辑操作。支持的逻辑运算有:and、andNot、or、Xor。这些将在本文中讨论。
1。和(位集设置):该方法对该目标位集和自变量位集执行逻辑“与”，并返回第二位集中也存在的第一位集的值。
Declaration :
public void and(BitSet set)
Parameters :
set : a bit set
Return Value :
This method does not return a value.
// Java code to demonstrate the working
// of and(Bitset set) in Bitset
import java.util.*;
public class BitSetAnd {
public static void main(String[] args)
{
// Declaring 2 bitsets
BitSet bset1 = new BitSet(5);
BitSet bset2 = new BitSet(5);
// adding the values to bset1
// using set()
bset1.set(0);
bset1.set(1);
bset1.set(2);
bset1.set(3);
// adding the values to bset2
// using set()
bset2.set(2);
bset2.set(4);
bset2.set(6);
bset2.set(0);
// printing the initial sets
System.out.println("The elements of Bitset 1 are : " + bset1);
System.out.println("The elements of Bitset 2 are : " + bset2);
// perform "and" operation between two bitsets
// using and()
bset1.and(bset2);
// printing the new bset1
System.out.println("The resultant bset1 after and operation is : " + bset1);
}
}
输出:
The elements of Bitset 1 are : {0, 1, 2, 3}
The elements of Bitset 2 are : {0, 2, 4, 6}
The resultant bset1 after and operation is : {0, 2}
2。andNot(位集):此方法执行逻辑与非，并返回第一个位集的元素，这些元素不在参数位集中。
Declaration :
public void andNot(BitSet set)
Parameters :
set: the BitSet with which to mask this BitSet.
Return Value :
This method does not return a value.
// Java code to demonstrate the working
// of andNot(Bitset set) in Bitset
import java.util.*;
public class BitSetNotAnd {
public static void main(String[] args)
{
// Declaring 2 bitsets
BitSet bset1 = new BitSet(5);
BitSet bset2 = new BitSet(5);
// adding the values to bset1
// using set()
bset1.set(0);
bset1.set(1);
bset1.set(2);
bset1.set(3);
// adding the values to bset2
// using set()
bset2.set(2);
bset2.set(4);
bset2.set(6);
bset2.set(0);
// printing the initial sets
System.out.println("The elements of Bitset 1 are : " + bset1);
System.out.println("The elements of Bitset 2 are : " + bset2);
// perform "not-and" operation between two bitsets
// using andNot()
bset1.andNot(bset2);
// printing the new bset1
System.out.println("The resultant bset1 after andNot operation is : " + bset1);
}
}
输出:
The elements of Bitset 1 are : {0, 1, 2, 3}
The elements of Bitset 2 are : {0, 2, 4, 6}
The resultant bset1 after andNot operation is : {1, 3}
3。或(位集设置):该方法对该目标位集和参数位集执行逻辑或，并返回两个位集中的所有值，不返回重复的元素。
Declaration :
public void or(BitSet set)
Parameters :
set : a bit set
Return Value :
This method does not return a value.
// Java code to demonstrate the working
// of or(Bitset set) in Bitset
import java.util.*;
public class BitSetOr {
public static void main(String[] args)
{
// Declaring 2 bitsets
BitSet bset1 = new BitSet(5);
BitSet bset2 = new BitSet(5);
// adding the values to bset1
// using set()
bset1.set(0);
bset1.set(1);
bset1.set(2);
bset1.set(3);
// adding the values to bset2
// using set()
bset2.set(2);
bset2.set(4);
bset2.set(6);
bset2.set(0);
// printing the initial sets
System.out.println("The elements of Bitset 1 are : " + bset1);
System.out.println("The elements of Bitset 2 are : " + bset2);
// perform "or" operation between two bitsets
// using or()
bset1\. or (bset2);
// printing the new bset1
System.out.println("The resultant bset1 after or operation is : " + bset1);
}
}
输出:
The elements of Bitset 1 are : {0, 1, 2, 3}
The elements of Bitset 2 are : {0, 2, 4, 6}
The resultant bset1 after or operation is : {0, 1, 2, 3, 4, 6}
4。异或(位集):该方法执行逻辑异或，并返回存在于一个位集中但不存在于另一个位集中的那些元素。
Declaration :
public void xor(BitSet set)
Parameters :
set a bit set.
Return Value :
This method does not return a value.
// Java code to demonstrate the working
// of xor(Bitset set) in Bitset
import java.util.*;
public class BitSetXor {
public static void main(String[] args)
{
// Declaring 2 bitsets
BitSet bset1 = new BitSet(5);
BitSet bset2 = new BitSet(5);
// adding the values to bset1
// using set()
bset1.set(0);
bset1.set(1);
bset1.set(2);
bset1.set(3);
// adding the values to bset2
// using set()
bset2.set(2);
bset2.set(4);
bset2.set(6);
bset2.set(0);
// printing the initial sets
System.out.println("The elements of Bitset 1 are : " + bset1);
System.out.println("The elements of Bitset 2 are : " + bset2);
// perform "xor" operation between two bitsets
// using xor()
bset1\. xor (bset2);
// printing the new bset1
System.out.println("The resultant bset1 after xor operation is : " + bset1);
}
}
输出:
The elements of Bitset 1 are : {0, 1, 2, 3}
The elements of Bitset 2 are : {0, 2, 4, 6}
The resultant bset1 after xor operation is : {1, 3, 4, 6}
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