INFO1113 × Final Exam

• • Topics
  • • Text File I / O
  • Notes
  • • Static & Non-static
  • Practice Exam

复习中…持续更新…（个人笔记 仅供参考T T)

Topics

Text File I / O

• Week 1 Notes

1. Input
① Scanner

import java.util.Scanner;
Scanner sc = new Scanner(System.in); // create a scanner object

String a = sc.nextline(); // catch next line
String b = sc.next(); // catch next word
int c = sc.nextInt(); // catch next integer

② Command Line Arguments

• If not having inputs, will raise ArrayIndexOutOfBoundsException.

String s = args[0];
int n = Integer.parseInt(args[0]);

// length of command line arguments
int length = args.length;

2. Output

System.out.println("Hello World!"); // print on the next line
System.out.print("Hello World!"); // print on the same line

3. printf formatting

• Character: %2c
• Integer: %5d
• Floating-point number: %6.2f (2 digits after the decimal in a field of 6 spaces)
• String: %10s

Notes

Static & Non-static

W1: Static modifier allows it to be accessed without the need of an object

• Static和Non-static的区别
• Static和Non-static方法

Practice Exam