3.
4.
5.
javac.exe compiler
the interpreter java.exe
6.
Hello World big hump
helloWorld small hump
7.
Character constant: // null character can not be entered must have a character between the two single quotes
bool type of true and false can be directly displayed
The last one is the wrong wording, can not display null
8. The basic data types
9. Note that the use of long type digital to increase L, float empathy
num6=3000000L;
System.out.println(num6);
10.