采用java语言编写的三维机械手臂的程序，可以自己设置自由度，可以设置旋转角度，对学习java和机器人都有借鉴意义,Using java language arm of the three-dimensional mechanical procedures, you can set up their own freedom and the rotation angle of the robot. It can be a reference to learn java and robot.

對兩個自由度的質量塊作位置分析，並以動畫顯示質量塊真實動作，雙彈簧分析。-Two degrees of freedom for the location of mass analysis, and animation shows that the true mass movement, double-spring analysis.

完整实现了与苹果一模一样的滑动按钮，包括拖动过程中的按钮变化，自由度与苹果完全一样，实时变化样式-With apple for the same slide button, including drag the button in the process of change, freedom and apple are exactly the same, real-time change style

通过自由度，置信度或者显著性水平求解卡方临界值-Solving the critical value of the chi square by degrees of freedom, confidence or significance level