用一个int类型保存32个boolean类型的值代码,Java代码库,德仔网

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【Java】用一个int类型保存32个boolean类型的值

作者:Simmery / 发布于2014/6/9/ 531

此类是从asp.net源代码中找到的一个很有用的类。现将此类翻译成java。一个SimpleBitVector32类型的对象能保存32个标志位，相当于32个boolean类型的变量，但在SimpleBitVector32内部只是使用了一个int类型的字段，这样就用一个int类型的变量来替代32个boolean类型的变量，大大节省了内存开销。


	public class SimpleBitVector32 {
	 private int data;

	 public int getIntegerValue(){
	 return this.data;
	 }

	 public void setIntegerValue(int value){
	 this.data = value;
	 }

	 public boolean getThis(int bit){
	 return (this.data & bit) == bit;
	 }

	 public void setThis(int bit, boolean value){
	 int num = this.data;
	 if (value)
	 this.data = num | bit;
	 else
	 this.data = num & ~bit;
	 }

	 public int getThis(int mask, int offset){
	 return (this.data & mask) >> offset;
	 }

	 public void setThis(int mask, int offset, int value){
	 this.data = this.data & ~mask | value << offset;
	 }

	 public SimpleBitVector32(int data){
	 this.data = data;
	 }

	 public void set(int bit){
	 this.data |= bit;
	 }

	 public void clear(int bit){
	 this.data &= ~bit;
	 }
	}

	

	

	public class Main {

	public static void main(String[] args) {
	 SimpleBitVector32 data = new SimpleBitVector32(0);
	 System.out.println("The old boolean value at index 0:" + data.getThis(1));
	 System.out.println("The old boolean value at index 1:" + data.getThis(2));
	 System.out.println("The old boolean value at index 2:" + data.getThis(2*2));
	 System.out.println("The old boolean value at index 3:" + data.getThis(2*2*2));
	 System.out.println("The old boolean value at index 3:" + data.getThis(2*2*2*2));
	 System.out.println("The old boolean value at index 5:" + data.getThis(2*2*2*2*2));
	 System.out.println();
	 data.setThis(1, true);
	 data.setThis(2, false);
	 data.setThis(2*2, true);
	 data.setThis(2*2*2, false);
	 data.setThis(2*2*2*2, true);
	 data.setThis(2*2*2*2*2, false);
	 System.out.println("The new boolean value at index 0:" + data.getThis(1));
	 System.out.println("The new boolean value at index 1:" + data.getThis(2));
	 System.out.println("The new boolean value at index 2:" + data.getThis(2*2));
	 System.out.println("The new boolean value at index 3:" + data.getThis(2*2*2));
	 System.out.println("The new boolean value at index 4:" + data.getThis(2*2*2*2));
	 System.out.println("The new boolean value at index 5:" + data.getThis(2*2*2*2*2));
	 System.out.println("The value inside SimpleBitVector32 is:" + data.getIntegerValue());
	 System.out.print("//");
	 for (int i = 31; i >= 0; i--) {
	 System.out.print(((data.getIntegerValue() & (1 << i)) >>> i));
	 }
	}
	}

试试其它关键字

　int类型　　 boolean　

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.用一个int类型保存32个boolean类型的值