Matrix3 { @Override public String toString() { return "[" + this.m[0] + ", " + this.m[1] + ", " + this.m[2] + "], " + '[' + this.m[3] + ", " + this.m[4] + ", " + this.m[5] + "], " + '[' + this.m[6] + ", " + this.m[7] + ", " + this.m[8] + ']'; } Matrix3();  Matrix3(double m11, double m12, double m13,
                   double m21, double m22, double m23,
                   double m31, double m32, double m33);  Matrix3(Matrix3 matrix); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); Matrix3 set(double m11, double m12, double m13,
                       double m21, double m22, double m23,
                       double m31, double m32, double m33); Matrix3 set(Matrix3 matrix); Matrix3 setTranslation(double x, double y); Matrix3 setRotation(double angleDegrees); Matrix3 setScale(double xScale, double yScale); Matrix3 setToIdentity(); Matrix3 setToTranslation(double x, double y); Matrix3 setToRotation(double angleDegrees); Matrix3 setToScale(double xScale, double yScale); Matrix3 setToVerticalFlip(); Matrix3 setToTileTransform(Sector src, Sector dst); Matrix3 setToMultiply(Matrix3 a, Matrix3 b); Matrix3 multiplyByTranslation(double x, double y); Matrix3 multiplyByRotation(double angleDegrees); Matrix3 multiplyByScale(double xScale, double yScale); Matrix3 multiplyByVerticalFlip(); Matrix3 multiplyByTileTransform(Sector src, Sector dst); Matrix3 multiplyByMatrix(Matrix3 matrix); Matrix3 multiplyByMatrix(double m11, double m12, double m13,
                                    double m21, double m22, double m23,
                                    double m31, double m32, double m33); Matrix3 transpose(); Matrix3 transposeMatrix(Matrix3 matrix); float[] transposeToArray(float[] result, int offset); Matrix3 invert(); Matrix3 invertMatrix(Matrix3 matrix); final double[] m; }
@Test public void testToString() throws Exception { String string = new Matrix3(11d, 12d, 13d, 21d, 22d, 23d, 31d, 32d, 33d).toString(); assertTrue("all elements in proper order", string.contains("[11.0, 12.0, 13.0], [21.0, 22.0, 23.0], [31.0, 32.0, 33.0]")); }