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1
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public class LambdaPerf
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2
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{
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3
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public static void main(String[] args)
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4
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throws Exception
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5
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{
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6
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LambdaPerf p = new LambdaPerf();
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7
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8
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{
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9
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long n1 = System.nanoTime();
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10
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for (int i = 0; i < 18_000_000; i++)
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11
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{
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12
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p.m1(false);
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13
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}
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14
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long n2 = System.nanoTime();
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15
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System.out.println("Lambda call: " + (n2 - n1) / 1_000_000d);
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16
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}
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17
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18
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{
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19
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long n1 = System.nanoTime();
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20
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for (int i = 0; i < 18_000_000; i++)
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21
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{
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22
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p.m1b(false);
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23
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}
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24
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long n2 = System.nanoTime();
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25
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System.out.println("Runnable call: " + (n2 - n1) / 1_000_000d);
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26
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}
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27
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28
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{
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29
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long n1 = System.nanoTime();
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30
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for (int i = 0; i < 18_000_000; i++)
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31
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{
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32
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p.getImpl(false);
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33
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}
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34
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long n2 = System.nanoTime();
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35
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System.out.println("Direct call: " + (n2 - n1) / 1_000_000d);
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36
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}
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37
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|
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38
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{
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39
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long n1 = System.nanoTime();
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40
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for (int i = 0; i < 18_000_000; i++)
|
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41
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{
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42
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try
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43
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{
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44
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p.getImpl2(false);
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45
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}
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46
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catch (Exception e)
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47
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{
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48
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|
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49
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}
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50
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}
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51
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long n2 = System.nanoTime();
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52
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System.out.println("Direct call with throw: " + (n2 - n1) / 1_000_000d);
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53
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}
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54
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}
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55
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|
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56
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public void m1(boolean create)
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57
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{
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58
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Object[] res = new Object[1];
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59
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timer((Operation) () -> {
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60
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res[0] = getImpl(create);
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61
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});
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62
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}
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63
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|
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64
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public void m1b(boolean create)
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65
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{
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66
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Object[] res = new Object[1];
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67
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timer(new Runnable() { public void run() {
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68
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res[0] = getImpl(create);
|
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69
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}
|
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70
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});
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71
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}
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72
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|
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73
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private Boolean getImpl(boolean create)
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|
74
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{
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75
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return null;
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|
76
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}
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|
77
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|
|
78
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private Boolean getImpl2(boolean create)
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|
79
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throws Exception
|
|
80
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{
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|
81
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return null;
|
|
82
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}
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|
83
|
|
|
84
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private void timer(Operation op)
|
|
85
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{
|
|
86
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try
|
|
87
|
{
|
|
88
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op.exec();
|
|
89
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}
|
|
90
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catch (Exception e)
|
|
91
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{
|
|
92
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e.printStackTrace();
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|
93
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}
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|
94
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}
|
|
95
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|
|
96
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private void timer(Runnable r)
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|
97
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{
|
|
98
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r.run();
|
|
99
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}
|
|
100
|
|
|
101
|
@FunctionalInterface
|
|
102
|
public static interface Operation
|
|
103
|
{
|
|
104
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public void exec()
|
|
105
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throws Exception;
|
|
106
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}
|
|
107
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}
|
|
108
|
|