java - 将两个字符串分成子字符串并将它们配对

Question

我正在为这个问题寻找有趣的解决方案:

String key = "1;2;3;4";
String value = "Value1;Value2;Value whitespace;"

现在';'将每个值与另一个值相除。相同的符号“;”还分配键。

现在我想结束:

{"1" : "Value1", "2" : "Value2", "3" : "Value whitespace", "4" : null}

当然，如果值大于键，则 null 不应该是该对的左侧(null:“Value5”)。

我使用 char 数组为这个问题做了一个相当复杂的解决方案，但对于很多情况和东西来说是一个很大的解决方案。(它是 O(n))。所以我很好奇看到正则表达式或子字符串解决方案或不包含大循环的东西。

编辑:我的解决方案:

private List<ExampleObject> getExampleObjects(String key , String value) {
    // s
    if (key  == null || value == null) {
        return new ArrayList<ExampleObject>();
    }

    List<ExampleObject> exampleObjects = new ArrayList<ExampleObject>();

    char[] keyToCharArray = key.toCharArray();
    char[] valueToCharArray = value.toCharArray();

    StringBuilder name = new StringBuilder();
    StringBuilder value = new StringBuilder();

    boolean nameCompleted = false;
    boolean valueCompleted = false;

    for (int i = 0, j = 0; i < keyToCharArray.length || j < valueToCharArray.length;) {
        if (!nameCompleted) {
            char a = ' ';
            try{
                 a = keyToCharArray[i];
            } catch(Exception e){
                 a = ';';
                // throw : VALES and key  not match. More key  then value
                //throw(e);
            }

            if (a == ';' ) {
                nameCompleted = true;
            } else if (!(i + 1 < keyToCharArray.length)){
                name.append(a);
                nameCompleted = true;
            }   else {
                name.append(a);

            }
            i++;
        }
        if (!valueCompleted) {

            char a = ' ';
            try{
                 a = valueToCharArray[j];
            } catch(Exception e){
                 a = ';';
                // throw : VALES and key  not match. More value then key 
                //throw(e);
            }

            if (a == ';') {
                valueCompleted = true;
            } else if(!(j + 1 < valueToCharArray.length)) {
                value.append(a);
                valueCompleted = true;
            } else {
                value.append(a);
            }
            j++;
        }
        if (nameCompleted && valueCompleted) {
            exampleObjects.add(new ExampleObject(name.toString(), value.toString()));
            name.setLength(0);
            value.setLength(0);
            nameCompleted = false;
            valueCompleted = false;
        }
    }
    return exampleObjects;
}

其中ExampleObject.class具有字段key和value。

Answer 1

我已经找到了解决您问题的方法:

输出

{"1" : "Value1", "2" : "Value2", "3" : "Value whitespace", "4" : "null"}       

代码

public class HelloWorld{

     public static void main(String []args){
        String key = "1;2;3;4";
        String value = "Value1;Value2;Value whitespace;";

        String[] keyArr = key.split(";");
        String[] valueArr = value.split(";");

        String finalJSON = "{";
        for(int i=0; i<(keyArr.length > valueArr.length ? keyArr.length : valueArr.length); i++) {

            try {
                finalJSON += "\"" + keyArr[i] + "\"";
            }
            catch(ArrayIndexOutOfBoundsException e) {
                finalJSON += "\"null\"";
            }

            finalJSON += " : ";

            try {
                finalJSON += "\"" + valueArr[i] + "\"";
            }
            catch(ArrayIndexOutOfBoundsException e) {
                finalJSON += "\"null\"";
            }
            if(i!=(keyArr.length > valueArr.length ? keyArr.length : valueArr.length) - 1) 
                finalJSON += ", ";
        }
        finalJSON += "}";

        System.out.println(finalJSON);
     }
}