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AutoBoxingPerf.java

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package ch09;

public class AutoBoxingPerf {

public static void main(String[] args) {

long startTime;

// int 원시형 1억 번 계산

startTime = System.currentTimeMillis();

int sum1 = 0;

for (int i = 0; i < 100000000; i++)

sum1 += i;

System.out.printf("int 원시형 1억 번 계산: %s밀리초\n", System.currentTimeMillis() - startTime);

// ---

// Integer 참조형 1억 번 계산

startTime = System.currentTimeMillis();

Integer sum2 = 0;

for (int i = 0; i < 100000000; i++)

sum2 += i;

System.out.printf("Integer 참조형 1억 번 계산: %s밀리초\n", System.currentTimeMillis() - startTime);

}

}