Java Learning Class2

Java Learning Class2

A Test the return value of the main function

1.:

2. Conclusion: The main function has a fixed return value type and cannot be changed, otherwise the compilation fails

Two Test variable range with the same name

1.:

2. Conclusion: Java follows the principle of proximity, and if data of the same name already exists within the scope of this scope, it is calculated according to the values in this scope

Three Test the accuracy of a double

1.:

2. Conclusion: The result of the calculation using a double type of numerical value is imprecise.

Four Properties of Test +

1.:

2. Conclusion: In Java, the + number is not only a function of adding value, but also a function of connecting two different operations.

Five Java Data Transformation

1.:

2. Conclusion: In addition to the floating point between the conversion of other types of floating-point numbers to lose precision

Java Learning Class2