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Test processing time (loop vs. contains)
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//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { List<String> count = new ArrayList<>(); for(int i = 1; i <= 1000000; i++) { count.add(String.valueOf(i)); } long startTime = System.currentTimeMillis(); System.out.println(count.contains("50")); long endTime = System.currentTimeMillis(); System.out.println("contain " + (endTime - startTime)); startTime = System.currentTimeMillis(); for(int i = 0;i < count.size();i++) { if(count.get(i).equals("50")) { System.out.println("true"); break; } } endTime = System.currentTimeMillis(); System.out.println("loop " + (endTime - startTime)); } }
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Compilation time: 1.06 sec, absolute running time: 0.63 sec, cpu time: 0.8 sec, memory peak: 113 Mb, absolute service time: 1,7 sec
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true contain 1 true loop 0