Why is the Java library source code so strangely indented?

I often rely on the JDK source code to understand how I should implement an interface, and I often find some very strange indentation style at use. For instance, in DefaultCellEditor.java:

public DefaultCellEditor(final JTextField textField) {
    editorComponent = textField;
this.clickCountToStart = 2;
    delegate = new EditorDelegate() {
        public void setValue(Object value) {
    textField.setText((value != null) ? value.toString() : "");
        }

    public Object getCellEditorValue() {
    return textField.getText();
    }
    };
textField.addActionListener(delegate);
}

I'm wondering if this is due to my IDE or not, since I find this kind of indentation quite strange and difficult to read.