JAVAutil。比特集。Java中的clear（）

有 三 clear（）方法的变体：

1. 清除（）： clear（）方法将该位集中的所有位设置为false。

   public void clear()
   Return Value
   This method does not return a value.
   

   // 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：

   The bitset before clear() operation is : {0, 1, 2, 3, 4}
   The bitset after clear() operation is : {}
   

2. 清除（内部位置）： clear（int-pos）方法将索引指定的位设置为false。即 从位集中删除 .

   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 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：

   The bitset before clear(pos) operation is : {0, 1, 2, 3, 4}
   The bitset after clear(pos) operation is : {0, 1, 2, 4}
   

3. 清除（int frompos，int topos）： clear（int-frompos，int-topos）方法将指定frompos（包含）到指定topos（排除）的位设置为false，即 在一定范围内执行删除操作 .

   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 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：

   The bitset before clear(frompos, topos) operation is : {0, 1, 2, 3, 4}
   The bitset after clear(frompos, topos) operation is : {0, 1, 4}
   

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