protected void setFieldSeparatorAtStart(boolean fieldSeparatorAtStart) {
        this.fieldSeparatorAtStart = fieldSeparatorAtStart;
    }
<p>Sets whether the field separator should be added at the start
of each buffer.</p>

@param fieldSeparatorAtStart  the fieldSeparatorAtStart flag
@since 2.0
android/android_framework/base/src/main/java/lang3/builder/ToStringStyle.java