我的打印功能只能打印一页，所以我尝试将其更改为打印多页。我现在已经改变了我的代码来打印两页。但第二页始终是空白页。
因此，在一个页面上可以打印27个“任务”。每页有3行，每行包含9个任务。我已经尝试更改if语句以使其打印第二页但无法使其工作。
if ((i < 9) || ((i>=3*9) && (i<4*9)))
else if ((i < 2*9) || ((i>=4*9) && (i<5*9)))
else if ((i < 3*9) || ((i>=5*9) && (i<6*9))){
示例代码（原谅编写得不好的代码）：
public class Printer implements Printable {
private ArrayList<Task> dataTasks;
private ArrayList<Tag> dataTags;
private int tasksPerPage = 27;
public int print(Graphics g, PageFormat pf, int pageIndex) throws PrinterException {
if (pageIndex * tasksPerPage >= dataTasks.size()) {
return NO_SUCH_PAGE;
}
Graphics2D g2d = (Graphics2D) g;
g2d.translate(pf.getImageableX(), pf.getImageableY());
Font titleFont = new Font("Courier New", Font.PLAIN, 12);
g2d.setFont(titleFont);
for (int i = tasksPerPage * pageIndex; i < dataTasks.size() && i < tasksPerPage * (pageIndex + 1); i++){
if ((i < 9) || ((i>=3*9) && (i<4*9))){
g.drawString("Task: " + dataTasks.get(i).getName(), 10, 10 + i * 90);
g.drawString("Created: " + dataTasks.get(i).getCreationDate().toString(true,false), 10, 22 + i * 90);
g.drawString("Deadline: " + dataTasks.get(i).getDeadline().toString(true,true), 10, 34 + i * 90);
g.drawString("Compl.: " + dataTasks.get(i).getCompletionDate().toString(true,true),10,46+i*90);
if (dataTasks.get(i).gettagIdList().size() == 0){
g.drawString("Tags: ", 10, 46 + i * 90);
} else {
for (int j = 0; j < dataTasks.get(i).gettagIdList().size(); j++) {
for (int k = 0; k < dataTags.size(); k++) {
if (dataTasks.get(i).gettagIdList().get(j) == dataTags.get(k).getId()){
if (j == 0){
g.drawString("Tags: " + dataTags.get(k).getName(), 10, 58 + i * 90);
} else {
g.drawString(" " + dataTags.get(k).getName(), 10, 58 + i * 90 + j * 10);
}
}
}
}
}
} else if ((i < 2*9) || ((i>=4*9) && (i<5*9))){
int move1 = 202;
g.drawString("Task: " + dataTasks.get(i).getName(), move1, 10 + (i-9) * 90);
g.drawString("Created: " + dataTasks.get(i).getCreationDate().toString(true,false), move1, 22 + (i-9) * 90);
g.drawString("Deadline: " + dataTasks.get(i).getDeadline().toString(true,true), move1, 34 + (i-9) * 90);
g.drawString("Compl.: "+dataTasks.get(i).getCompletionDate().toString(true,true),move1,46+(i-9)*90);
if (dataTasks.get(i).gettagIdList().size() == 0){
g.drawString("Tags: ", move1, 46 + (i-9) * 90);
} else {
for (int j = 0; j < dataTasks.get(i).gettagIdList().size(); j++) {
for (int k = 0; k < dataTags.size(); k++) {
if (dataTasks.get(i).gettagIdList().get(j) == dataTags.get(k).getId()){
if (j == 0){
g.drawString("Tags: " + dataTags.get(k).getName(), move1, 58 + (i-9) * 90);
} else {
g.drawString(" " + dataTags.get(k).getName(), move1, 58 + (i-9) * 90 + j * 10);
}
}
}
}
}
} else if ((i < 3*9) || ((i>=5*9) && (i<6*9))){
int move2y = 392;
int move2x = (i-18) * 90;
g.drawString("Task: " + dataTasks.get(i).getName(), move2y, 10 + move2x);
g.drawString("Created: " + dataTasks.get(i).getCreationDate().toString(true,false), move2y, 22 + move2x);
g.drawString("Deadline: " + dataTasks.get(i).getDeadline().toString(true,true), move2y, 34 + move2x);
g.drawString("Compl.: "+dataTasks.get(i).getCompletionDate().toString(true,true),move2y,46+move2x);
if (dataTasks.get(i).gettagIdList().size() == 0){
g.drawString("Tags: ", move2y, 46 + move2x);
} else {
for (int j = 0; j < dataTasks.get(i).gettagIdList().size(); j++) {
for (int k = 0; k < dataTags.size(); k++) {
if (dataTasks.get(i).gettagIdList().get(j) == dataTags.get(k).getId()){
if (j == 0){
g.drawString("Tags: " + dataTags.get(k).getName(), move2y, 58 + move2x);
} else {
g.drawString(" " + dataTags.get(k).getName(), move2y, 58 + move2x + j * 10);
}
}
}
}
}
}
}
return PAGE_EXISTS;
}