int elements = 2000000; int tries = 100; String values[] = new String[elements]; IntStream.range(0, elements).forEach( el -> { values[el]=el+""; } ); long t0 = System.currentTimeMillis(); IntStream.range(0, tries).parallel().forEach( i -> { ArrayListal = new ArrayList (); IntStream.range(0, elements).parallel().forEach( j -> { al.add(values[j]); } ); }); long t1= System.currentTimeMillis(); IntStream.range(0, tries).parallel().forEach( i -> { LinkedList ll = new LinkedList (); IntStream.range(0, elements).parallel().forEach( j -> { ll.add(values[j]); } ); }); long t2 = System.currentTimeMillis(); System.out.println("Add to ArrayList: "+(t1-t0)/tries+" ms avg, cnt="+elements+", tries="+tries); System.out.println("Add to LinkedList: "+(t2-t1)/tries+" ms avg, cnt="+elements+", tries="+tries); -- Add to ArrayList: 18 ms avg, cnt=2000000, tries=100 Add to LinkedList: 77 ms avg, cnt=2000000, tries=100
środa, lutego 22, 2017
Czy ArrayList jest szybsze od LinkedList? #3
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