staticfield.java

来自「一个开源的JAVA虚拟机」· Java 代码 · 共 26 行

public class StaticField {
    public static int Power(int m, int n) {
	if (n == 0) {
	    return 1;
	} else if ((n & 1) == 0) {
	    GlobalCounter.inc();
	    return Power(m * m, n >>> 1);
	} else {
	    GlobalCounter.inc();
	    GlobalCounter.inc();
	    return m * Power(m * m, n >>> 1);
	}
    }
    public static void main(String[] args) {
	System.out.println(Power(2, 7));
	System.out.println(GlobalCounter.value());
	GlobalCounter.reset();
	System.out.println(Power(2, 14));
	System.out.println(GlobalCounter.value());
	GlobalCounter.reset();
	System.out.println(Power(2, 28));
	System.out.println(GlobalCounter.value());
    }
}