字符串不能转换为java错误

String cannot be cast to java error

MyButton4不工作，输出显示错误，

Exception in thread"AWT-EventQueue-0"
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer at knapsacproject.Interface.getTableData(Interface.java:198)

它显示了这一行错误，

tableData[i] = (int) model.getValueAt (i,colIndex);

怎么了？

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public int[] getTableData(DefaultTableModel model, Integer colIndex) {
int nRow = model.getRowCount();
int[] tableData = new int [nRow];

for(int i = 0; i< nRow; i++) {
tableData[i] = (int) model.getValueAt (i,colIndex);
}
return tableData;
}

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
DefaultTableModel model = (DefaultTableModel)jTable1.getModel();
int nRow = model.getRowCount();

algorithm algo = new algorithm(getTableData(model, 1),getTableData(model, 2),
Integer.parseInt(jTextField1.getText()),Integer.parseInt(jTextField2.getText()),Integer.parseInt(jTextField3.getText()));
int[] result = algo.getResult();

for(int i = 0; i < nRow; i++) {
if(result[i]==1)
model.setValueAt("take", i , 3);
else
model.setValueAt("leave", i, 3);
}
}