plugins/InspectionGadgets/test/com/siyeh/igtest/performance/manual_array_copy/ManualArrayCopyInspection.java

   1 package com.siyeh.igtest.performance.manual_array_copy;
   2
   3 public class ManualArrayCopyInspection
   4 {
   5
   6     public void fooBar()
   7     {
   8         final int[] q = new int[3];
   9         final int[] a = new int[3];
  10         for(int i = 0; i < a.length; i++)
  11             q[i] = a[i];
  12         for(int i = 0; i < a.length; i++)
  13             q[i+3] = a[i+4];
  14         for(int i = 0; i < a.length; i++)
  15         {
  16             q[i] = a[i];
  17         }
  18         for(int i = 0; i < a.length; i++)
  19         {
  20             q[i+3] = a[i];
  21         }
  22         for(int i = 1; i < a.length; i++)
  23         {
  24             q[2+i] = a[i-1];
  25         }
  26         for(int i = 1; i < a.length; i++)
  27             // not a legal array copy
  28             q[2-i] = a[i-1];
  29     }
  30
  31     void barFoo() {
  32         int added_index = 3;
  33         int[] array = new int[10];
  34         int[] new_array = new int[14];
  35         for (int i=0;i<array.length;i++) array[i] = i;
  36         for (int i = 0; i < array.length; i++)
  37         {
  38             new_array[added_index + i] = array[i];
  39         }
  40         System.out.print("Old Array: ");
  41         for (int i : array) System.out.print(i+" ");
  42         System.out.println();
  43         System.out.print("New Array: ");
  44         for (int i : new_array) System.out.print(i+" ");
  45         System.out.println();
  46     }
  47
  48     static void foobarred(int[] a, int[] b) {
  49         int x = 3;
  50         for(int i = x ; i < a.length; i++) {
  51             b[i - x] = a[i];
  52         }
  53     }
  54
  55     void boom() {
  56         byte image[] = new byte[10];
  57         int data[] = new int[10];
  58         for (int k = 0; k < 5; ++k) { // breaks if converted to System.arraycopy()
  59             image[k] = (byte)data[k];
  60         }
  61     }
  62
  63     void boomboom() {
  64         Object target[] = new Object[10];
  65         String source[] = new String[10];
  66         for (int k = 0; k < 5; k++) { // can be converted to System.arraycopy()
  67             target[k] = source[k];
  68         }
  69     }
  70
  71     static Integer[] nono(int[] ints) {
  72         Integer[] array = new Integer[ints.length];
  73         for ( int i = 0; i < ints.length; i++ ) {
  74             array[i] = ints[i];
  75         }
  76         return array;
  77     }
  78 }