Java怎么实现输入一个string表达式然后输出计算的结果.docx

public class Test public static int yunsuanjibie(String s) int r = 0; int p = 0; for (int i = 0; i s.length(); i+) if (s.charAt(i) = + | s.charAt(i) = - | s.charAt(i) = * | s.charAt(i) = /) p+; String k = new String2 * p + 1; int k1 = 0; int first = 0; for (int i = 0; i 0) for (int i = 0; i -1; l-) if (!(kl.equals(p) break; int q; for (q = i + 1; q k.length; q+) if (!(kl.equals(p) break; if (ki.equals(*) ki = + (Integer.parseInt(kl) * Integer .parseInt(kq); kl = p; kq = p; kp-; else ki = + (Integer.parseInt(kl) / Integer .parseInt(kq); kl = p; kq = p; kp-; break; for (int i = 0; i -1; l-) if (!(kl.equals(p) break; int q; for (q = i + 1; q k.length; q+) if (!(kq.equals(p) break; if (ki.equals(+) ki = + (Integer.parseInt(kl) + Integer .parseInt(kq); kl = p; kq = p; kp-; else ki = + (Integer.parseInt(kl) - Integer .parseInt(kq); kl = p; kq = p; kp-; break; for (int i = 0; i k.length; i+) if (!(ki.equals(p) r = Integer.parseInt(ki); break; return r; public static void sizeyunsuan(String s) while (true) int first = 0; int last = 0; for (int i = 0; i s.length(); i+) if (s.charAt(i) = () first = i; if (s.charAt(i) = ) last = i; break; if (last = 0) System.out.println(yunsuanjibie(s); return; else String s1 = s.substring(0, first); String s2 = s.substring(first + 1, last); String s3 = s.substring(last + 1, s.length(); s = s1 + yunsuanjibie(s2) + s3; public static void main(String args) Strin