Why is Java known as Plat Form Neutral Language?

https://www.computersprofessor.com/2016/05/why-is-java-known-as-plat-form-neutral.html
Computers Fundamentals, MS Office, C, Java, Web Technology.
S2 = S1 . to lowercase: Converts the string S1 to all lower case. S2 = S1 to upper case: Converts the string S1 to all upper S2 = S1. Replace (...
1. The classes contained in the packages of other programs can be easily reused. 2. In packages, classes can be unique compared with classes in other packages. That is, two classes in two differe...