Question

我试图测试我的方法，但是我在使用logAsArray时遇到了问题。当我运行它时，输出返回看起来像机器代码。我想我必须使用toString（），但我无法弄清楚它放在哪里...... 测试最小时，我也得到一个空指针异常。任何想法将不胜感激。

    public class hw {
public static void main(String[] args){
String name = null;
LinkedStringLog myInstance =  new LinkedStringLog(name);
myInstance.insert("Bob");
myInstance.insert("Carl");
myInstance.insert("Ace");
myInstance.insert("Steve");
myInstance.insert("Mike");
myInstance.size();
int i = (myInstance.size());
while ( i != 0) {
System.out.println(myInstance.name);
System.out.println(myInstance.size());
System.out.println(myInstance.isEmpty());
System.out.println(myInstance.howMany(""));
System.out.println(myInstance.uniqInsert(""));
myInstance.smallest());
System.out.println(myInstance.logAsArray());
i--;    }}

}

    public String[] logAsArray(){
  String values[] = new String [size()];
    LLStringNode node;
    node = log;
    int i = 0;
      while (node != null){
      values[i] = node.getInfo();
      node = node.getLink();
      i++;
      }
      return values;  }



    public String smallest(){
LLStringNode node;
LLStringNode node2;
LLStringNode node3 = log;
node = log;
node2 = log;
String smallString = "A";
boolean notNull = (node != null);
boolean notNull2 = (node2 != null);
while (notNull && notNull2){               
 System.out.println(node.getInfo() + " " + node2.getInfo());
 if (node.getInfo().compareTo(node2.getInfo()) <= 0) // null pointer exception
 {
 node3 = node;
 node2 = node2.getLink();
 smallString = node3.getInfo();
 }
 else if (notNull && notNull2)
 {
 node3 = node2;
node = node.getLink();
smallString = node3.getInfo();
      }
 smallString = node3.getInfo();
 }      
return smallString;}



      public int size()
      // Returns the number of Strings in this StringLog.
      {
        int count = 0;
        LLStringNode node;
        node = log;
        while (node != null)
        {
          count++;
          node = node.getLink();
         }
        return count;  }

Answer 1

您可能必须遍历日志并打印每个特定的字符串。

for (String s : whateverLog)
    System.out.println(s);

格式字符串链接列表中的数组

1 个答案: