Поздно было спать хотел, и опечатался, вот как нужно
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public class TestObjectComparator implements Comparator<TestObject> {
@Override
public int compare(TestObject arg0, TestObject arg1) {
int compNum=compareNum(arg0,arg1);
if (compNum!=0) return compNum;
int compName=compareName(arg0,arg1);
if (compName!=0) return compName;
return compareId(arg0,arg1);
}
private int compareNum(TestObject arg0, TestObject arg1){
if (arg0.num==arg1.num) return 0;
else if (arg0.num==0 || arg0.num>arg1.num) return 1;
else return -1;
}
private int compareName(TestObject arg0, TestObject arg1){
if (arg0.name==null && arg1.name==null) return 0;
else if (arg0.name==null) return 1;
else if (arg1.name==null) return -1;
else return arg0.name.compareTo(arg1.name);
}
private int compareId(TestObject arg0, TestObject arg1){
return arg0.id.compareTo(arg1.id);
}
}
