2019獨角獸企業重金招聘Python工程師標準>>>

public?class?CPUTest?{??

??????

????//定義時間片大小（毫秒）??

????public?static?final?double?TIME?=?1000;??

????//畫直線方法??

????private?static?void?lineGraph(double?rate)?throws?InterruptedException{??

????????while?(true){??

????????????doSomeSimpleWork(rate?*?TIME);??

????????????Thread.sleep((long)?(TIME?-?rate?*?TIME));??

????????}??

????}??

????//畫正弦曲線方法??

????private?static?void?sinGraph()?throws?InterruptedException{??

????????double?x?=?0;??

????????double?y?=?0;?????????

????????while?(true){??

????????????y?=?(Math.sin(x)?+?1)?*?TIME?/?2;??

????????????doSomeSimpleWork(y);??

????????????x?+=?0.1;??

????????????Thread.sleep((long)?(TIME?-?y));??

????????}??

????}??

????//占用CPU方法??

????private?static?void?doSomeSimpleWork(double?time)?{??

????????long?startTime?=?System.currentTimeMillis();??

????????while?((System.currentTimeMillis()?-?startTime)?<?time)?{??

????????}??

????}??

??????

????/**?

?????*?@param?args?the?command?line?arguments?

?????*/??

????public?static?void?main(String[]?args)?throws?InterruptedException?{??

????????lineGraph(0.5);??

??????? sinGraph();??

????}??

??????

}??

?

?

package cglib;

?

public class jiekou {

??? public static void drawLine(){?? ?
??????? int usage = 700; ?
??????? System.out.println("Test Begins...");??????? ?
??????? while(true){???????? ?
??????????? long start = System.currentTimeMillis(); ?
??????????? while(System.currentTimeMillis() - start < usage ); ?
??????????? try{ ?
??????????????? Thread.sleep(1000-usage); ?
??????????? }catch(Exception e){ ?
??????????????? System.out.print(e); ?
??????????? }??????? ?
??????? } ?
??? } ?
??? public static void drawSin(){ ?
??????? double x = Math.PI / 2;? ?
??????? while(true){ ?
??????????? //下面這一句+1是因為sinx可能為負數，最大為-1,加上1的話就保證為正了 ?
??????????? //*0.5是應為加1之后，最大數可能達到2，為了限制在1以內，所以*0.5 ?
??????????? long usage = (long)((Math.sin(x)+1)*0.5*1000); ?
??????????? System.out.println(usage); ?
??????????? long start =? System.currentTimeMillis(); ?
??????????? while(System.currentTimeMillis() - start < usage); ?
??????????? try{ ?
??????????????? Thread.sleep(1000 - usage); ?
??????????? }catch(Exception e){ ?
??????????????? System.out.print(e); ?
??????????? } ?
??????????? x += 0.1; ?
??????? } ?
??? }??? ?
??? public static void drawSinSpeedup(){ ?
??????? double x = Math.PI / 2;? ?
??????? //加入了刷新時間，可以調控曲線彎曲程度 ?
??????? int flushtime = 5000; ?
??????? while(true){ ?
??????????? long usage = (long)((Math.sin(x)+1)*0.5*flushtime); ?
??????????? System.out.println(usage); ?
??????????? long start =? System.currentTimeMillis(); ?
??????????? while(System.currentTimeMillis() - start < usage); ?
??????????? try{ ?
??????????????? Thread.sleep(flushtime - usage); ?
??????????? }catch(Exception e){ ?
??????????????? System.out.print(e); ?
??????????? } ?
??????????? x += 0.1; ?
??????? } ?
??? } ?
?? ?
??? public static void main(String[] args) throws InterruptedException { ?
?? ??? ?drawLine(); ?
?? ??? ?drawSin(); ?
??? } ?

??? }

轉載于:https://my.oschina.net/u/2822116/blog/723882

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