【发布时间】:2011-10-06 07:27:51
【问题描述】:
我遇到的一个问题是我有 2 个 JTextAreas,我需要向它们添加一个项目列表。 我遇到的问题是字符串在到达 JTextArea 末尾时不会自动移动到下一行。所以为了解决这个问题,我尝试了这个:(对不起,如果我的代码有点草率。)
public void setIncludeAndExclude(ArrayList<JComboBox> boxes){
String in = "",ex = "";
String[] inSplit, exSplit;
boolean[] include = new boolean[boxes.get(0).getModel().getSize()-1];
for(int i = 0; i < boxes.size(); i ++){
if(boxes.get(i).getSelectedIndex() != 0){
include[boxes.get(i).getSelectedIndex() -1] = true;
}
}
for(int i = 0; i < include.length; i ++){
if(include[i]){
//numToItem is a method that turns an int into a string e.g. 1 = "Acesss Doors"
in += (numToItem(i+1)+ ", ");
}else{
ex += (numToItem(i+1)+ ", ");
}
}
//take off the last comma
in = in.substring(0,in.lastIndexOf(","));
ex = ex.substring(0,ex.lastIndexOf(","));
//get how many lines there should be
inSplit = new String[(in.length()/100) +1];
exSplit = new String[(ex.length()/100) +1];
String temp;
int istart = 0, iend = Math.min(100, in.length()), estart = 0, eend = Math.min(100, ex.length());
for(int i = 0; i < inSplit.length; i ++){
try{
temp = in.substring(istart, iend);
int Iindex = temp.lastIndexOf(",");
temp = ex.substring(estart, eend);
int Eindex = temp.lastIndexOf(",");
inSplit[i] = in.substring(istart, Iindex);
exSplit[i] = ex.substring(estart, Eindex);
istart = Iindex; iend = Math.min(iend + 100, in.length());
estart = Eindex; eend = Math.min(eend + 100, ex.length());
}catch(Exception e){
e.printStackTrace();
}
}
//reset in and ex to ""
in = ""; ex = "";
//set in and ex to the new string with newline characters
for(int i = 0; i < inSplit.length; i ++){
in += inSplit[i] + "\n";
ex += exSplit[i] + "\n";
}
//set the text of the JTextAreas
Include.setText(in);
Exclude.setText(ex);
}
任何关于我可以做不同或改变的帮助将不胜感激
【问题讨论】:
标签: java swing newline substring jtextarea