编写Java应用程序,创建一个Rectangle类，提供属性了length，width，要求定义为private，int型，默认值都为均为1，该类提供以下方法：

public boolean setLength(int length)　　//设置长度，确保不会有负值

public boolean setWidth(int width)　　//设置宽度，确保不会有负值

public int getLength()//得到长度

public int getWidth()//得到长度

public int perimeter()　　//计算周长

public int area()　　//计算面积

public boolean isSuqare()　　//判断是否是正方形

再编写一个测试类，由用户输入长度和宽度，打印出相关信息。

-Write a Java application, create a Rectangle class attributes of length, width, defined as private, int type, default value are a class provides the following method: public boolean setLength (int length)// set length to ensure that no negative public boolean setWidth (int width)// set width, to ensure that there will be no negative public int getLength ()// get length public int getWidth ()// length public int word perimeter ()// calculate the perimeter public int area ()// to calculate the area public boolean isSuqare ()// determine whether the square and then write a test class, length and width of the input by the user to print out the relevant information.