jlist listModel arrayOutOfBounds在20项

Question

我有一个DefautListModel，它从目录中读取文件名。每当我有超过19个文件时，我都会得到：

java.lang.ArrayIndexOutOfBoundsException: Index 20 out of bounds for length 20

我为ensureCapacity()尝试了listModel。 我为setVisibleRowCount()

尝试了Jlist

有什么建议吗？

    // get the file list
    String[] newList = getFileList();
    // create a list model
    listModel = new DefaultListModel<>();
    listModel.ensureCapacity( 1000 );
    for (String s : newList) {
      listModel.addElement(s);
    }

    // add the model to the jlist
    recipeList = new JList(listModel);
    recipeList.setName( "recipes" );
    recipeList.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
    recipeList.setLayoutOrientation(javax.swing.JList.VERTICAL);
    recipeList.setVisibleRowCount( recipeList.getModel().getSize() );
    JScrollPane toScroll = new JScrollPane( recipeList,
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
            JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );