import java.math.BigDecimal;
import java.util.Scanner;
public class test{
//å®ä¹åçåå¾åé
private static double radius = 0;
//å®ä¹åçé¢ç§¯åé
private static double square = 0;
//å®ä¹çä½ä½ç§¯çåé
private static double volume = 0;
//è¾å
¥åçåå¾å¹¶è®¡ç®åºè¯¥åå¾æ对åºåçé¢ç§¯åçä½ä½ç§¯
private static void inputRadius() {
System.out.print("请è¾å
¥åçåå¾:");
/**è¾å
¥åçåå¾ï¼å¦æè¾å
¥çæ¯éæ°å¼åçæ°ï¼
ä¼åºç°å¼å¸¸ï¼æ
ç¨try...catch...finally代ç åæ¥å¤çå¼å¸¸*/
try {
radius = new Scanner(System.in).nextDouble();
/**å½è¾å
¥åçåå¾å°é¨æçäº0æ¶ï¼
æ示è¾å
¥é误ï¼å¹¶éå½è°ç¨è¾å
¥æ¹æ³*/
if (radius <= 0) {
System.out.println("ååå¾ä¸è½å°äºæçäº0ï¼");
System.out.println("");
inputRadius();
}else {
//åé¢ç§¯è®¡ç®å
¬å¼ä¸ºåé¢ç§¯çäºâ(âå3.14)ä¹ä»¥ååå¾çå¹³æ¹
square = 3.14 * radius * radius;
/**çä½ä½ç§¯è®¡ç®å
¬å¼ä¸ºçä½ä½ç§¯çäºâ(âå3.14)ä¹ä»¥
ååå¾çç«æ¹ä¹ä»¥4é¤ä»¥3ï¼ä¹å¯ä»¥è¿æ ·ç®
å 为â(âå3.14)ä¹ä»¥ååå¾çå¹³æ¹çäºçä½ä¸å¿åçé¢ç§¯ï¼
æ以çä½ä½ç§¯è¿å¯ä»¥çäºçä½ä¸å¿åçé¢ç§¯ä¹ä»¥çä½ä¸å¿åçåå¾
ä¹ä»¥4é¤ä»¥3*/
volume = square * radius * 4 /3;
//è¾åºè¯¥åå¾åçé¢ç§¯åçä½ä½ç§¯ï¼å¹¶ç¨åèäºå
¥ï¼ä¿ç2ä½å°æ°
System.out.println("该åå¾åçé¢ç§¯æ¯ï¼" +
new BigDecimal(square).setScale(2,BigDecimal.ROUND_HALF_DOWN));
System.out.println("该åå¾ççä½ç§¯æ¯ï¼" +
new BigDecimal(volume).setScale(2,BigDecimal.ROUND_HALF_DOWN));
}
} catch (Exception e) {
/**å½è¾å
¥ä¸æ¯æ°å¼ç±»åæ¶ï¼åºç°å¼å¸¸ç±catchå¤ç
æ以ä¼æ示è¾å
¥é误ï¼ç¶åéå½è°ç¨è¾å
¥æ¹æ³*/
System.out.println("è¾å
¥é误ï¼è¯·éæ°è¾å
¥ï¼");
System.out.println("");
inputRadius();
}finally{
/**finally代ç åå¨ä¸ç®¡ä»ä¹æ¶åé½æ§è¡ï¼
æ
éå®å½è¾å
¥åå¾å°äºæçäº0æ¶ï¼æä¼æ§è¡æ¤å¤è¯å¥*/
if (radius <= 0) {
System.out.println("ååå¾ä¸è½å°äºæçäº0ï¼");
System.out.println("");
inputRadius();
}
}
}
public static void main(String[] args) {
inputRadius();
}
}
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