cputime.java

这是一个在linux环境下

package fr.umlv.projet.procfs;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
/**
 * This class is used to load or change Cpu time.
 * @author MA Xiao Jun & HUANG Wei
 */
public class CpuTime {

	private String cpuName;
	private float user;
	private float nice;
	private float system;
	private float idle;
	
	/**
	 * Load the cpu time by read the file "/proc/stat".And evaluate the corresponding value.
	 */
	public void loadCpuTime(){
		try {
			Scanner sc = new Scanner(new File("/proc/stat"));
			this.cpuName = sc.next();
			this.user = Float.parseFloat(sc.next());
			this.nice = Float.parseFloat(sc.next());
			this.system = Float.parseFloat(sc.next());
			this.idle = Float.parseFloat(sc.next());
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}

	/**
	 * Return the name of cpu.
	 * @return the name of cpu.
	 */
	public String getCpuNameTime() {
		return cpuName;
	}
	/**
	 * Return the idle time of cpu.
	 * @return value of idle time.
	 */
	public float getIdleTime() {
		return idle;
	}

	/**
	 * Return the NiceTime of cpu.
	 * @return value of NiceTime.
	 */
	public float getNiceTime() {
		return nice;
	}
	/**
	 * Return the system time of cpu.
	 * @return value of SystemTime.
	 */
	public float getSystemTime() {
		return system;
	}
	/**
	 * Return the UserTime of cpu
	 * @return value of UserTime.
	 */
	public float getUserTime() {
		return user;
	}
	
	/**
	 * Return the total time of cpu
	 * @return sum of user time,nice time,system time and idle time .
	 */
	public float getTotalTime(){
		return user + nice + system + idle; 
	}
	/**
	 * Change the value of cputime.
	 * @param cputime the new cputime. 
	 */
	public void setTime(CpuTime cputime){
		this.user = cputime.user;
		this.nice = cputime.nice;
		this.system = cputime.system;
		this.idle = cputime.idle;
	}

}