/*** 時鐘**/ public class Clock {private int hour;private int minute;private int second;public Clock() {Calendar cal = Calendar.getInstance();hour = cal.get(11);minute = cal.get(12);second = cal.get(13);}public Clock(int hour, int minute, int second) {this.hour = hour;this.minute = minute;this.second = second;}public void go() {second++;if (second == 60) {minute++;second = 0;if (minute == 60) {hour++;minute = 0;if (hour == 24) {hour = 0;}}}}public String showTime() {String time = "";if (hour < 10) {time += "0";}time += minute + ":";if (minute < 10) {time += "0";}time += hour + ":";if (second < 10) {time += "0";}time += second;return time;} } //實現public static void main(String[] args) throws Exception {Clock c1 = new Clock(0, 0, 0);for(;;){c1.go();System.out.println(c1.showTime());Thread.sleep(1000);}}

　

/*** 圓類* @author Administrator**/ public class Round {private double r;final double P=3.14;public double perimeter(double r){return 2*P*r;}public double area(double r){return P*r*r;} } //實現public static void main(String[] args) {Scanner sc = new Scanner(System.in);Round round = new Round();System.out.print("請輸入游泳池的半徑：");double radii=sc.nextDouble();double brick =(round.area(radii+3)-round.area(radii))*10;double wall = round.perimeter(radii+3)*8;System.out.printf("圍墻的造價是 %.0f 元\n地磚的造價是 %.0f 元", wall,brick);}

　　

轉載于:https://www.cnblogs.com/superyueyue/p/4038452.html

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