我想做10个JLabel,怎么初始化名称啊? JPanel[] JPane = new JPanel[10];
JLabel[] JLabe = new JLabel[10];
String[] names = {"学生编号","学生姓名","入学时间","毕业时间",
"出生日期","籍贯","政治面貌","学籍情况","年级","学位"}; for(int i =0 ; i < 10; i ++)
{
System.out.println(names[i]);
JLabe[i].setName(names[i]);
}
JTextField[] JTF = new JTextField[10];
for(int i =0 ; i < 10; i ++)
{
JPane[i].add(JLabe[i]);
JPane[i].add(JTF[i]);
add(JPane[i]);
}我是这样做的,但是不用运行...报错信息:Exception in thread "main" java.lang.NullPointerException
at wshong.packag.Jpane.<init>(MainTest.java:51)
at wshong.packag.TestFrame.<init>(MainTest.java:21)
at wshong.packag.MainTest.main(MainTest.java:10)请问是怎么回事?怎么样解决
JLabel[] JLabe = new JLabel[10];
String[] names = {"学生编号","学生姓名","入学时间","毕业时间",
"出生日期","籍贯","政治面貌","学籍情况","年级","学位"}; for(int i =0 ; i < 10; i ++)
{
System.out.println(names[i]);
JLabe[i].setName(names[i]);
}
JTextField[] JTF = new JTextField[10];
for(int i =0 ; i < 10; i ++)
{
JPane[i].add(JLabe[i]);
JPane[i].add(JTF[i]);
add(JPane[i]);
}我是这样做的,但是不用运行...报错信息:Exception in thread "main" java.lang.NullPointerException
at wshong.packag.Jpane.<init>(MainTest.java:51)
at wshong.packag.TestFrame.<init>(MainTest.java:21)
at wshong.packag.MainTest.main(MainTest.java:10)请问是怎么回事?怎么样解决
con.add(组件名)