Question

JTextField创建了二维数组 但一直报错空指针 求大神解答

JTextField[][] scores= new JTextField[10][6];

for(int i=0;i<scores.length;i++){
for(int j=0; j<scores[i].length;j++){
scores[i][j]=new JTextField("默认");
}
}

JPanel p1=new JPanel();

p1.setLayout(new GridLayout(11,6,0,0));

p1.add(new JLabel("姓名"));
DataInputStream Input1 = new DataInputStream(new FileInputStream("a.txt"));
try{while(true)
{p1.add(new JLabel(Input1.readUTF()));
}
}
catch(EOFException ex){

}
for(int i=0;i<scores.length;i++){
for(int j=0; j<scores[i].length;j++){
p1.add(scores[i][j]);
}
}

add(p1);
JPanel p2=new JPanel(new GridLayout(1,3,10,10));

JButton a=new JButton("确认");
JButton b=new JButton("返回");
JButton c=new JButton("继续添加");

p2.add(a);
p2.add(b);
p2.add(c);
add(p1,BorderLayout.CENTER);
add(p2,BorderLayout.SOUTH);
a.addActionListener(new ButtonListener());
b.addActionListener(new bListener());
c.addActionListener(new cListener());

Answer 1

JTextField[][] scores= new JTextField[10][6];
要放到类变量，不要放在方法、构造里面