49 lines
1015 B
Java
49 lines
1015 B
Java
package debugging;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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public class StringMergingIterator implements Iterator<String> {
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private Iterator<String> first;
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private Iterator<String> second;
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private boolean turnSwitch;
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public StringMergingIterator(Iterator<String> first, Iterator<String> second){
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this.first = first;
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this.second = second;
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this.turnSwitch = true;
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}
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@Override
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public boolean hasNext() {
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return first.hasNext() || second.hasNext();
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}
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@Override
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public String next() {
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if(! hasNext()){ throw new NoSuchElementException(); }
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String result = null;
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if(! first.hasNext()){
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result = second.next(); // Switch which iterator to return from
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} else if(! second.hasNext()){
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result = first.next();
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} else {
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if(turnSwitch){
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result = first.next();
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turnSwitch = false;
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} else { // This block would execute after the previous with two ifs
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result = second.next();
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turnSwitch = true;
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}
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}
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return result;
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}
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}
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