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StringCompression.java
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27 lines (25 loc) · 894 Bytes
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public class StringCompression {
public int compress(char[] array) {
if (array.length == 0) return 0;
StringBuilder accumulator = new StringBuilder();
char current = array[0];
int count = 1;
for (int index = 1 ; index < array.length ; index++) {
if (array[index] == current) {
count++;
} else {
accumulator.append(current).append(count > 1 ? count : "");
current = array[index];
count = 1;
}
}
accumulator.append(current).append(count > 1 ? count : "");
copyInto(array, accumulator);
return accumulator.length();
}
private void copyInto(char[] array, StringBuilder buffer) {
for (int index = 0 ; index < buffer.length() ; index++) {
array[index] = buffer.charAt(index);
}
}
}