JAVA实验报告_实验2__

Java Object-Oriented Programming Experimental ReportStudent ID Name ClassLocation Teacher Time1.Experimental purposes and requirements1.1 Print and println, String literals, String concatenation, Escape sequences1.2 Variables, Constants, Assignment, Integers and Floating point, Arithmetic Expressions, Operator Precedence, Input using the Scanner class1.3 HTML, Applets, Graphics, Colors2.Experimental equipment (environment) and requirements2.1 Eclipse2.2 Window XPb Exercises(Please see Lab Manual)3.1 Names and Places(Choose to do)3.1.13.1.23.1.33.2 Table of Student Grades(Choose to do)/\\\\\\\\\\\\\\\\\\\\\\\ (1)(2)(3)3.3 Two Meanings of Plus(1)(2)(3)解释语句一：第一个输出结果是85，没加括号从左到右运算前第一句为字符串则8和5为字符串，有85(4)解释语句二：第二个输出结果为13，在输出语句中默认优先进行带括号的运算，8和5为整型，变成数字之后在从左到右运算，左面第一个为字符串则运算完的13也为字符型(5)解释语句三：无括号，从左到右运算，其中第三句为字符串则从左到右全识别为字符型则853.4 Pre-lab Exercises（1）常量是静态变量，不会更改，全程序共用同一个常量名变量可以在不同类中同时存在不属于本类的变量名，值可以不同（2）第一句：定义变量x第二句：定义整型变量x值为3第三句：啥都不是（3）(4)A 73B -14C 0.3D 3.333E 1.57F 4.03G 0.248H 4.29I 0.31J 1K 1（5）修改语法错误（已修改完）import java.util.Scanner;public class errors{public static void main (String[] args){String Name; // Name of the userint number;int numSq;Scanner scan = new Scanner(System.in);System.out.print ("Enter your name, please: ")；Name = scan.nextString();System.out.print ("What is your favorite number?“);number = scan.nextInt();numSq = number * number;System.out.println (Name +", the square of your number is "+numSquared);}}3.5 Area and Circumference of a Circle(1)(2)(3)3.6 Painting a Room(Choose to do) (1)(2)3.7 Ideal Weight(1)(2)3.8 Lab Grades(Choose to do)3.9 Base Conversion(Choose to do)3.10 Introduction to HTML(Choose to do) 3.11 Drawing Shapes(2)x,y修改为0(3)高和宽改为200 300(4)400 40 50 200(4)矩形打印(5)椭圆3.12 The Java Coordinate System(Choose to do)3.13 Drawing a Face(Choose to do)3.14 Creating a Pie Chart(Choose to do)3.15 Colors in Java(Choose to do)4.Experimental results and data processing5.Analysis and discussionScore: 6.Teacher ReviewsExperimental Report List1 Names and Places1) Source code list3.1package test_java_01;//*************************************************************** //Names.java////Prints a list of student names with their hometowns//and intended major//*************************************************************** public class Test_java_01_1{// ------------------------// main prints the list// ------------------------public static void main (String[] args){System.out.println ();System.out.println ("\tName\t\tHometown");System.out.println ("\t====\t\t========");System.out.println ("\tprince\t\tblack_dragon_river_province"); System.out.println ("\tcircle\t\tWashington");System.out.println ();}}package test_java_01;//*************************************************************** //Names.java////Prints a list of student names with their hometowns//and intended major//*************************************************************** public class Test_java_01_1{// ------------------------// main prints the list// ------------------------public static void main (String[] args){System.out.println ();System.out.println ("\tName\t\tHometown\t\tmajor\t");System.out.println ("\t====\t\t========\t\t==========="); System.out.println ("\tprince\t\tblack_drass\t\tcomputer");System.out.println ("\tcircle\t\tWashington\t\tghhhh");System.out.println ();}}3.2public class Test_java_01_1{// ------------------------// main prints the list// ------------------------public static void main (String[] args){System.out.println("\t//////////////////////\t"+"\t\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\ \t");System.out.println ("\t======\t\tStudent Points\t\t=====\t ");System.out.println ("\tName\t\tLab\t\tBonus\t\tTotal ");System.out.println ("\t----\t\t---\t\t-----\t\t----- ");System.out.println ("\tJoe\t\t43\t\t7\t\t50\t ");System.out.println ("\tWiam\t\t50\t\t8\t\t58 ");System.out.println ("\tMaue\t\t3\t\t1\t\t4 ");System.out.println ("\tMarSue\t\t9\t\t10\t\t9 ");System.out.println ("\tMSue\t\t39\t\t10\t\t49 ");}}3.3(3)package test_java_01;import java.util.Scanner;public class PlusTest {public static void main (String[] args){int vail1,vail2,vail3;double average;Scanner scan=new Scanner(System.in);vail1=scan.nextInt();vail2=scan.nextInt();vail3=scan.nextInt();average=((double)vail1+(double)vail2+(double)vail3)/3;System.out.println("Please enter three integers and " +"I will compute their average :"+average);}}3.43.5(1)package test_java_01;public class sdd_3_5 {public static void main(String[] args){final double PI = 3.14159;int radius = 10;double area = PI * radius * radius;double line = PI * 2 * radius;System.out.println("The area of a circle with radius " + radius + " is " + area);radius = 20;area = PI * radius * radius;area = PI * radius * radius;System.out.println("The area of a circle with radius " + radius + " is " + area);}}(2)package test_java_01;public class sdd_3_5 {public static void main(String[] args){final double PI = 3.14159;int radius = 10;double area = PI * radius * radius,area2=4*area,area3;double line = PI * 2 * radius,line2=2*line,line3;double a,a1;a=line2-line;a1=area2/area;System.out.println("The area of a circle with radius " + radius + " is " + area);System.out.println("The line of a circle with radius " + radius + " is " + line);System.out.println(a+" "+a1);radius = 20;line3 = PI * 2 * radius;area3 = PI * radius * radius;System.out.println("The line of a circle with radius " + radius + " is " + line3);System.out.println("The area of a circle with radius " + radius + " is " + area3);}}(3)package test_java_01;import java.util.Scanner;public class sdd_3_5 {public static void main(String[] args){final double PI = 3.14159;Scanner scan=new Scanner(System.in);System.out.println("put in two number:");int a=scan.nextInt(),b=scan.nextInt();int c=a*b;System.out.println("number :"+c);}}3.6(1)package test_java_01;import java.util.Scanner;public class Area_jisuan_2 {public static void main(String[] args) {final int COVERAGE = 350;Scanner scan = new Scanner(System.in);System.out.print("put in length width and height:");int length = scan.nextInt(),width = scan.nextInt(),height =scan.nextInt();double totalSqFt,paintNeeded;paintNeeded = height*width*2 + width*length*2 + length*height*2;totalSqFt = paintNeeded/COVERAGE;System.out.print("the paintNeeded:"+ paintNeeded+" the totalSqFt:" +totalSqFt);}}(2)package test_java_01;import java.util.Scanner;public class Area_jisuan_2 {public static void main(String[] args) {final int COVERAGE = 350,doorsarea = 20,windowarea = 15 ;Scanner scan = new Scanner(System.in);System.out.println("put in length width and height:");int length = scan.nextInt(),width = scan.nextInt(),height =scan.nextInt();int doors,window;System.out.println("windows number and doors number:");window=scan.nextInt();doors=scan.nextInt();char i;double totalSqFt,paintNeeded;paintNeeded = height*width*2 + width*length*2 + length*height*2 - doors*doorsarea - windowarea*window;totalSqFt = paintNeeded/COVERAGE;System.out.print("the paintNeeded:"+ paintNeeded+" the totalSqFt:" +totalSqFt);}}3.7package test_java_01;import java.util.Scanner;public class weight {public static void main(String[] args) {int male1 = 14, female1 = 5;int weightreall,i=0,l;System.out.print("put in male or female:");Scanner scan = new Scanner(System.in);String c=scan.next();String b=new String("male");System.out.print("put in your height:");double height=scan.nextDouble(),ol,k;ol=height%1;ol=(2*ol*100+1)/20;if(b.equals(c)){weightreall = male1*(int)ol + 100;}else{weightreall = female1*(int)ol + 100;}System.out.print(weightreall);}}(2)package test_java_01;import java.util.Scanner;public class weight {public static void main(String[] args) {int male1 = 14, female1 = 5;int weightreall,i=0,l,weightreallf;System.out.print("put in male or female:");Scanner scan = new Scanner(System.in);String c=scan.next();String b=new String("male");System.out.println("put in your height:");double height=scan.nextDouble(),ol,k;ol=height%1;ol=(2*ol*100+1)/20;weightreall = male1*(int)ol + 100;double wei=weightreall,min,max;min=wei*0.85;max=wei*1.15;System.out.println("最佳体重范围男"+min+"-----"+max);weightreallf =female1*(int)ol +100;wei = weightreallf;min=wei*0.85;max=wei*1.15;System.out.println("最佳体重范围男"+min+"-----"+max);if(b.equals(c)){System.out.print("你的体重"+weightreall);}else{System.out.print("你的体重"+weightreallf);}}}3.8（1）四矩形打印//********************************************//Hello.java////Print a Hello, World message.//********************************************package test_java_01;import javax.swing.JApplet;import java.awt.*;public class hello extends JApplet{public void paint (Graphics page){final int MAX_SIZE = 300;final int PAGE_WIDTH = 600;final int PAGE_HEIGHT = 400;int x, y;int width, height;setBackground (Color.yellow);page.setColor (Color.blue);x = 400;y = 400;width = 150;height = 150;// Draw the rectanglepage.fillRect(x, y, width, height);page.setColor (Color.cyan);page.fillRect(x, y, width-50, height-50);page.setColor (Color.green);page.fillRect(x, y-40, width-100, height+50);page.fillRect(x-200, y-200, width-100, height+50);}}（2）来两个椭圆//********************************************//Hello.java////Print a Hello, World message.//******************************************** package test_java_01;import javax.swing.JApplet;import java.awt.*;public class hello extends JApplet{public void paint (Graphics page){final int MAX_SIZE = 300;final int PAGE_WIDTH = 600;final int PAGE_HEIGHT = 400;int x, y;int width, height;setBackground (Color.yellow);page.setColor (Color.blue);x = 400;y = 400;width = 150;height = 150;// Draw the rectanglepage.fillOval(x, y, width, height);page.setColor (Color.cyan);page.fillRect(x, y, width-50, height-50);page.setColor (Color.green);page.fillRect(x, y-40, width-100, height+50);page.fillOval(x-200, y-200, width-10, height+50);}}2) Results data processing3)Answer questions4)Error Analysis and Discussion。