public EqualsBuilder append(Object lhs, Object rhs) {
        if (isEquals == false) {
            return this;
        }
        if (lhs == rhs) {
            return this;
        }
        if (lhs == null || rhs == null) {
            this.setEquals(false);
            return this;
        }
        Class<?> lhsClass = lhs.getClass();
        if (!lhsClass.isArray()) {
            // The simple case, not an array, just test the element
            isEquals = lhs.equals(rhs);
        } else if (lhs.getClass() != rhs.getClass()) {
            // Here when we compare different dimensions, for example: a boolean[][] to a boolean[]
            this.setEquals(false);
        }
        // 'Switch' on type of array, to dispatch to the correct handler
        // This handles multi dimensional arrays of the same depth
        else if (lhs instanceof long[]) {
            append((long[]) lhs, (long[]) rhs);
        } else if (lhs instanceof int[]) {
            append((int[]) lhs, (int[]) rhs);
        } else if (lhs instanceof short[]) {
            append((short[]) lhs, (short[]) rhs);
        } else if (lhs instanceof char[]) {
            append((char[]) lhs, (char[]) rhs);
        } else if (lhs instanceof byte[]) {
            append((byte[]) lhs, (byte[]) rhs);
        } else if (lhs instanceof double[]) {
            append((double[]) lhs, (double[]) rhs);
        } else if (lhs instanceof float[]) {
            append((float[]) lhs, (float[]) rhs);
        } else if (lhs instanceof boolean[]) {
            append((boolean[]) lhs, (boolean[]) rhs);
        } else {
            // Not an array of primitives
            append((Object[]) lhs, (Object[]) rhs);
        }
        return this;
    }
<p>Test if two <code>Object</code>s are equal using their
<code>equals</code> method.</p>

@param lhs  the left hand object
@param rhs  the right hand object
@return EqualsBuilder - used to chain calls.
android/android_framework/base/src/main/java/lang3/builder/EqualsBuilder.java