What is the difference between class adapter and object adapter design pattern

Object adapter contains adaptee , and class adapter inherits from adaptee.
If you have multiple adaptees, then you have to use object adapter.

// Object adapter version

public class ReportGenerator implements OldReporter {

private NewReportWriter newReporter = new NewReportWriter();

public void writeHeader(String headerData) {

newReporter.generateHeaderLines(headerData);

}

}

// Class adapter version

public class ReportGenerator extends NewReportWriter

implements OldReporter {

public void writeHeader(String headerData) {

generateHeaderLines(headerData);

}

}