testcpu.java

这是一个在linux环境下

package fr.umlv.projet.procfs;

/**
 * 
 * @author MA Xiao Jun & HUANG Wei
 *
 */
public class TestCpu {
	
	private static CpuTime oldtime = new CpuTime();
	private static CpuTime newtime = new CpuTime();
//	private static float cpuUsed = 0;

	public static CpuTime getoldtime(){
		return oldtime;
	}
	
	public static CpuTime getnewtime(){
		return newtime;
	}
	public static float calcul(CpuTime oldtime , CpuTime newtime){
		float use = newtime.getUserTime() - oldtime.getUserTime(); 
		float system = newtime.getSystemTime() - oldtime.getSystemTime();
		return ((use + system)*100.0f)/(newtime.getTotalTime() - oldtime.getTotalTime());
	}
	
	
	public static String changeFloatSize(float value,int size){
		String s = new String(value+"");
		int index = s.indexOf('.');
		float num = 0.5f;
		if(s.length()>index+size+1){
			if(s.charAt(index+size+1)>'4'){
				for(int i=0;i<size;i++)
					num *= 0.1f;
				value += num;
			}
		s = new String(value+"");
		String s1 = s.substring(0,index+size+1);
		return s1;}
		else return new String(value+"");
	}
	
//	public static String getCpuUsed(){
//		
//	}
	
	public static void main(String[] args) {
		oldtime.loadCpuTime();
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		while(true){
			newtime.loadCpuTime();
			System.out.println(calcul(oldtime,newtime));
			oldtime.setTime(newtime);
			try {
				Thread.sleep(3000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
//		float num = .126624f;
//		System.out.println(changeFloatSize(num,3));
	}
}