如何验证来自SWT Text小部件的输入并分配给变量？

Question

This SWT program has a Group called mBuy, which includes Text Field to enter a stock's buy price. Once the calculate button is pressed and event listener is activated, I want to assign whatever content is inside this text field to a variable, which I have initialized here.

final Text tmp0 = new Text(mBuy, SWT.SINGLE);
tmp0.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

// Calculate Button
Button tmp3 = new Button(mBuy, SWT.PUSH);
tmp3.setText("Calculate");
tmp3.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true));

// if calculate button is pressed
tmp3.addSelectionListener(new SelectionAdapter() {
    public void widgetSelected(SelectionEvent e) {
        //take the decimal value inside textbox 
        bPrice=Double.parseDouble(tmp0.getText());
        // don't show buy menu anymore
        mBuy.dispose();

    }
});

Answer 1

It's just tmp0.getText() . You should look at the Javadocs for SWT .