Java中数组之间的比较

    // null 元素是相等的.
    boolean[] bArr1 = null;
    boolean[] bArr2 = null;
    boolean b = Arrays.equals(bArr1, bArr2);                   // true
    
    // 比较两个boolean数组.
    bArr1 = new boolean[]{true, false};
    bArr2 = new boolean[]{true, false};
    b = Arrays.equals(bArr1, null);                            // false
    b = Arrays.equals(bArr1, bArr2);                           // true
    
    // 对于原生类型的数组可以用equals().
    b = Arrays.equals(new byte[]{0}, new byte[]{0});           // true
    b = Arrays.equals(new char[]{'a'}, new char[]{'a'});       // true
    b = Arrays.equals(new short[]{0}, new short[]{0});         // true
    b = Arrays.equals(new int[]{0}, new int[]{0});             // true
    b = Arrays.equals(new long[]{0L}, new long[]{0L});         // true
    b = Arrays.equals(new float[]{0F}, new float[]{0F});       // true
    b = Arrays.equals(new double[]{0D}, new double[]{0D});     // true
    
    // 如果比较的是Object型的数组，null元素是相等的.
    // 如果于元素不是null, Java虚拟机会自动调用Object.equals().
    b = Arrays.equals(new String[]{"a"}, new String[]{"a"});   // true
    b = Arrays.equals(new String[]{null}, new String[]{null}); // true
    b = Arrays.equals(new String[]{"a"}, new String[]{null});  // false

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