optaplanner-examples/src/main/java/org/optaplanner/examples/common/swingui/timetable/TimeTablePanel.java
public void defineColumnHeaderByKey(HeaderColumnKey xObject) {
        int x = layout.addColumn();
        xMap.put(xObject, x);
    }
public void defineColumnHeaderByKey(HeaderColumnKey xObject) {
        int x = layout.addColumn();
        xMap.put(xObject, x);
    }
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