jodd-core/src/main/java/jodd/util/StringBand.java
protected void expandCapacity() {
		String[] newArray = new String[array.length << 1];
		System.arraycopy(array, 0, newArray, 0, index);
		array = newArray;
	}
protected void expandCapacity() {
		String[] newArray = new String[array.length << 1];
		System.arraycopy(array, 0, newArray, 0, index);
		array = newArray;
	}
Expands internal string array by multiplying its size by 2.