编程语言的结构

1. Primitive data types
2. Arithmetic operators
3. Assignment operators
4. Relational operators
5. Logical operators
6. switch Statements
7. loop Statements ( while && do while && for)
8. if Statements
9. Console Input || Output
10. GUI Input Dialog
11. Message Dialog

Scanner input = new Scanner(System.in);

int intValue = input.nextInt();

long longValue = input.nextLong();

double doubleValue = input.nextDouble();

float floatValue = input.nextFloat();

double doubleValue = input.next();

String string = JOptionPane.showInputDialog(null,“Enter Input”);

int intValue = Integer.parseInt(string);

double doubleValue = Double.parseDouble(string);

JOptionPane.showMessageDialog(null,”Enter input”);