我的程序符合，但不显示任何信息

Question

我写这个程序来检查，如果{[("/*与}])"*/要求我们忽略的东西在注释块平衡。当我在终端上运行我的代码时，遇到了一个问题，无法打印出来。我知道错误在哪里，但我不知道为什么它是错误的。之后我尝试编写代码无视意见，我开始得到这个奇怪的问题。我们需要写出自己的堆栈类称为MyStack.java不过，所以我不会在这里包含它是非常简单的。

我认为问题发生在这里：

int start = str.indexOf("/*"); 
int end = str.indexOf("*/"); 
if(start != -1){ 
    str = str.substring(0,start) + str.substring(end+2); 

这里是整个代码：我希望没有任何逻辑上的谬误

import java.io.File; 
import java.io.FileNotFoundException; 
import java.util.Scanner; 


public class SymbolBalance { 

    public static void main(String[] args){ 
     if(args.length>0){ 
      try{ 
       Scanner input = new Scanner(new File (args[0])); 
       MyStack<Character> ms = new MyStack<>(); 
       String str; 
       char ch; 
       boolean quoteStart = true; 
       loop: while(input.hasNext()){ 
        str = input.next(); 
        int start = str.indexOf("/*"); 
        int end = str.indexOf("/*"); 
        if(start != -1){ 
         str = str.substring(0,start) + str.substring(end+2); 
         for(int i=0;i<str.length();i++){ 
         ch = str.charAt(i);  
          if(ch == '{'||ch =='(' || ch=='[')  
           { 
           ms.push(ch); 
           } 
          else if((ch == '/'&&i<str.length() -1&&str.charAt(i+1)=='*')){ 
           ms.push(str.charAt(i+1)); 
          } 

          else if (ch==')'){ 
           if(ms.isEmpty()||ms.pop()!= '('){ 
            System.out.println(") is mismatched"); 
            break loop; 
           } 
          } 
          else if(ch == ']'){ 
           if(ms.isEmpty() || ms.pop() != '['){ 
            System.out.println("] is mismatched"); 
            break loop; 
           }  
          } 
          else if(ch == '}'){ 
           if(ms.isEmpty() || ms.pop() != '{'){ 
            System.out.println("} is mismatched"); 
            break loop; 
           } 
          } 
          else if(ch == '*' && i<str.length()-1&&str.charAt(i+1) == '/'){ 
           if(ms.isEmpty() || ms.pop() != '*'){ 
            System.out.println("*/ is mismatched"); 
            break loop; 
           } 
          } 
          else if(ch == '"'){ 
           if(quoteStart == true) { 
            ms.push(ch); 
            quoteStart = false; 
           } 
           else { 
            if(ms.isEmpty() || ms.pop() != '"'){ 
             System.out.println(" \" is mismatched"); 
             break loop; 
            } 
            quoteStart = true; 
           } 
          } 
         } 
        } 
       } 
       input.close(); 
      } 
      catch(FileNotFoundException e){ 
        System.out.println("Cannot find file"); 
      } 

     } 
     else{ 
       System.out.println("No command line argument"); 
     } 
    } 

} 

在这里，我有一个例子输入文件：

/* this is to test whether the program ignores imbalances in the comment blocks */ 
public class Test3 { 
    public static void main(String[] args) { 
     boolean haveYouWatchedHamiltonYet = true; 
     int theSchuylerSisters = 3; 
     int alexanderhamilton = 1; 
     int aaronburr = 1; 

     boolean amIintheroom = theRoomWhereItHappens(); 


     /* this is a commented block. We're testing if your code 
     can deal with unbalanced things in the comments: /* 
     that was the test for here */ 
    } 

    /*just a general comment */ 
    /* this one has some errors /* { [ { [ } ] */ 


    public boolean theRoomWhereItHappens() { 
     boolean intheRoomWhereItHappens = false; 
     boolean isHappyAboutThis = false; 
     return intheRoomWhereItHappens && isHappyAboutThis; 

    } 
} 

Answer 1

您使用的是相同的字符来评论的开始和结束都：

int start = str.indexOf("/*"); 
    int end = str.indexOf("/*"); 

结束注释字符串应该是：

int end = str.indexOf("*/");