Java experiment 7 stream

Experiment 7 streams (2 hours) I. Purpose

1. Familiar with the usage of various common streams in the stream class library.

2. You can use stream classes to perform basic file read/write operations.

Ii. experiment content

1. Write a program, enter two integers in the console window, then receive the two integers, and output their sum. (Requirement: the keyboard input is obtained through the stream encapsulation system. In. Do not use the keyboard class)

2. design student for student. attributes: Number (integer), name (string), and score (integer ). Write a program: Requirement: (1) input the names and tokens of three students, save their names and tokens to data.txt; (2) then read data from the file to obtain the average score of the five students.

Iii. Lab requirements

Complete the program design and submit the lab report.

 

package Sum;import java.io.*;public class Sum {public static void main(String args[]) {BufferedReader br=new BufferedReader(new InputStreamReader(System.in));    String s1,s2;    int num1 = 0,num2 = 0;    try{    s1=br.readLine();num1=Integer.parseInt(s1);s2=br.readLine();num2=Integer.parseInt(s2);}catch (IOException e){e.printStackTrace();}    System.out.println(num1+"+"+num2+"="+(num1+num2)); }}

 

 

Package writetofile; import Java. io. *; public class student {public void input () {bufferedreader BR = new bufferedreader (New inputstreamreader (system. in); For (INT I = 0; I <3; I ++) {string SnO = NULL, sdegree = NULL, name = NULL; try {system. out. println ("Enter the student ID" + (I + 1) + ":"); SnO = BR. readline (); system. out. println ("input number" + (I + 1) + "Student name:"); name = BR. readline (); system. out. println ("input number" + (I + 1) + "Student Score:"); sdeg REE = BR. readline () ;}catch (ioexception E1) {e1.printstacktrace () ;}try {filewriter fw = new filewriter ("data.txt", true); bufferedwriter BW = new bufferedwriter (FW ); BW. write (SNO + "" + name + "" + sdegree); BW. newline (); BW. close (); FW. close ();} catch (ioexception e) {e. printstacktrace () ;}} public double average () {string STR = NULL; double AVG = 0; string [] [] temp = new string [3] [3]; filereader fr; Try {Fr = new filereader ("data.txt"); bufferedreader BR = new bufferedreader (FR); For (INT I = 0; (STR = Br. Readline ())! = NULL; I ++) {temp [I] = Str. split (""); AVG + = double. parsedouble (temp [I] [2]);} system. out. println ("3 average scores:" + AVG/3);} catch (exception e) {e. printstacktrace ();} return 0;} public static void main (string [] ARGs) throws ioexception {student s = new student (); S. input (); S. average ();}}