Java (5) 1 Lesson 3: x 2 +4x +5 f(x) =x 2 +4x +5 x f(10) x Java , 3.0,..., 10.0, 1.0, 2.0,... flow rate (m**3/s) "flow

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ちえこわくや
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1 Java (5) 1 Lesson 3: x 2 +4x +5 f(x) =x 2 +4x +5 x f(10) x Java , 3.0,..., 10.0, 1.0, 2.0,... flow rate (m**3/s) "flowrate.dat" time (s) 1 1

2 flow[0] = 1.0,..., flow[9] = time time 10 0, 1, 2,..., 9, 0, 1, flow[(int)time 10 ] flow[20] = flow[0] = 1.0 int index = (int) time % flow.length; // flow[index] % f(x) x TankCalculator3.java getflow report 2

3 1.2 TankCalculator3.java 1: public class TankCalculator3 { 2: final double TANK_AREA = 20.0; //20.0 m**2 3: final double INITIAL_TANK_LEVEL = 10.0; //10.0 m 4: double flow[] 5: = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0}; //m**3/s 6: 7: public double getflow(double t) { 8: int index = (int)t % flow.length; 9: return flow[index]; 10: } 11: 12: public void report(double time, double flow, double tanklevel) { 13: System.out.println(time + ", " + flow + ", " + tanklevel); 14: } 15: 16: public static void main(string args[]) { 17: TankCalculator3 calculator = new TankCalculator3(); 18: final int MAX_TIME = 50; 19: double tanklevel[] = new double[max_time+1]; //m 20: tanklevel[0] = calculator.initial_tank_level; 3

4 21: System.out.println("Time(s), Flow(m**3/s), Tank Level(m)"); 22: for (int i = 0; i< MAX_TIME; i++) { 23: double time = i; 24: tanklevel[i+1] = tanklevel[i] + calculator.getflow(time)/calculator.tank_area; 25: calculator.report(time, calculator.getflow(time), tanklevel[i]); 26: } 27: double finaltime = MAX_TIME; 28: calculator.report(finaltime, 0.0, tanklevel[max_time]); 29: } 30: } getflow() (time) (flow) (tanklevel) report() main() 4

5 17 TankCalculator3 new calculator calculator TankCalculator3 20,24,25,28 calculator. calculator. 5

6 1.3 Java C++ (object) 1 (class) new 1 C C 2 6

7 7

8 1.4 () 2 = new (); 17: TankCalculator3 calculator = new TankCalculator3(); 1. calculator 2. TankCalculator3 3. calculator 3 TankCalculator3.java TANK_AREA, INITIAL_TANK_LEVEL, flow[] calculator.tank AREA, calculator.report(...) 8

9 1.5 java TankCalculator3 getflow() report() class (,... ) { } 7: public double getflow(double t) { 8: int index = (int)t % flow.length; 9: return flow[index]; 10: } public private public private 9

10 static Lesson dynamic static void 4 java return return 4 main() 10

11 1.5.2 int double

12 1.6 java 3 1. /* */ 2. // 3. /** */ javadoc tanklevel = INITIAL_TANK_LEVEL + FLOW_RATE * time / TANK_AREA; tl = ITL + FR * t / TA; // 12

13 6 java 6 // set settime, get getflow, is isalive, has haschild 13

14 1.7 Javadoc Java javadoc 7 javadoc 7 Java web html @ javadoc TankCalculator4.java javadoc -d docs TankCalculator4.java -d docs html docs TankCalculator4.html web 14

15 Javadoc TankCalculator4.java 1: /** 2: * 3: 4: 3.0 5: */ 6: public class TankCalculator4 { 7: /** 8: * m**2 9: */ 10: final double TANK_AREA = 20.0; 11: /** 12: * m 13: */ 14: final double INITIAL_TANK_LEVEL = 10.0; //10.0 m 15: /** 16: * m**3/s 17: */ 18: double flow[] 19: = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0}; //m**3/s 20: 15

16 21: /** 22: (m**3/s) t mm*3/s 25: */ 26: public double getflow(double t) { 27: int index = (int)t % flow.length; 28: return flow[index]; 29: } 30: 31: /** 32: time flow tanklevel 36: */ 37: public void report(double time, double flow, double tanklevel) { 38: System.out.println(time + ", " + flow + ", " + tanklevel); 39: } 40: 41: public static void main(string args[]) { 16

17 42: TankCalculator4 tankcalculator = new TankCalculator(); 43: final int TIME_HORIZON = 100; 44: double tanklevel[] = new double[time_horizon+1]; //m 45: tanklevel[0] = tankcalculator.initial_tank_level; 46: System.out.println("Time(s), Flow(m**3/s), Tank Level(m)"); 47: for (int i = 0; i< TIME_HORIZON; i++) { 48: double time = i; 49: tanklevel[i+1] = tanklevel[i] + tankcalculator.getflow(time)/tankcalculator.tank_area; 50: tankcalculator.report(time, tankcalculator.getflow(time), tanklevel[i]); 51: } 52: double finaltime = TIME_HORIZON; 53: tankcalculator.report(finaltime, 0.0, tanklevel[time_horizon]); 54: } // End of main() method. 55: } // End of class TankCalculator4 javadoc M: java docs TankCalculator4.html 17

18 4 javadoc 18

19 while, for, if { }. javadoc HTML 19

Java (7) Lesson = (1) 1 m 3 /s m 2 5 m 2 4 m 2 1 m 3 m 1 m 0.5 m 3 /ms 0.3 m 3 /ms 0.6 m 3 /ms 1 1 3

Java (7) Lesson = (1) 1 m 3 /s m 2 5 m 2 4 m 2 1 m 3 m 1 m 0.5 m 3 /ms 0.3 m 3 /ms 0.6 m 3 /ms 1 1 3 Java (7) 2008-05-20 1 Lesson 5 1.1 5 3 = (1) 1 m 3 /s 1 2 3 10 m 2 5 m 2 4 m 2 1 m 3 m 1 m 0.5 m 3 /ms 0.3 m 3 /ms 0.6 m 3 /ms 1 1 3 1.2 java 2 1. 2. 3. 4. 3 2 1.3 i =1, 2, 3 V i (t) 1 t h i (t) i F, k