使用toString从哈希表获取字符串表示形式

Question

Just wondering what the best way to represent Strings are from Hash tables, I figured you would use an iterator somehow in a toString method but wasn't sure.

It should look something like the following

{5/10 = 3/9}
to
{true@5/10}@3/9

So far I have ( i know this doesn't use an iterator, since i wasn't really sure how to use it in this regard)

@Override
public String toString() {

    for (Map.Entry<BigFraction, BigFraction> entry : knowledgeD.entrySet()) {
        BigFraction key = entry.getKey();
        BigFraction value = entry.getValue();

where bigfraction is just a fraction datatype, replace it with whatever you want

Any help would be much appreciated

Answer 1

the following may work, I believe

@Override
public String toString()
{
    final StringBuilder builder = new StringBuilder();
    for (final Map.Entry<String, String> entry : myTable.entrySet())
    {
        builder.append(entry.getKey());
        builder.append("=>");
        builder.append(entry.getValue());
        builder.append("\n");
    }

    return builder.toString();
}

Answer 2

if you want to see exact toString() representation, you can open the HashTable class and have a look at the toString() method.
This is directly from JDK,

public synchronized String toString() {
    int max = size() - 1;
    if (max == -1)
        return "{}";

    StringBuilder sb = new StringBuilder();
    Iterator<Map.Entry<K,V>> it = entrySet().iterator();

    sb.append('{');
    for (int i = 0; ; i++) {
        Map.Entry<K,V> e = it.next();
            K key = e.getKey();
            V value = e.getValue();
            sb.append(key   == this ? "(this Map)" : key.toString());
        sb.append('=');
        sb.append(value == this ? "(this Map)" : value.toString());

        if (i == max)
        return sb.append('}').toString();
        sb.append(", ");
    }
    }