java学习笔记-4.22

1、 JTextArea txaDisplay = new JTextArea();

JScrollPane scroll = new JScrollPane(txaDisplay);

//把定义的JTextArea放到JScrollPane里面去

//分别设置水平和垂直滚动条自动出现

scroll.setHorizontalScrollBarPolicy(

JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

scroll.setVerticalScrollBarPolicy(

JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

//分别设置水平和垂直滚动条总是出现

scroll.setHorizontalScrollBarPolicy(

JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

scroll.setVerticalScrollBarPolicy(

JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);

//分别设置水平和垂直滚动条总是隐藏scroll.setHorizontalScrollBarPolicy(

JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

scroll.setVerticalScrollBarPolicy(

JScrollPane.VERTICAL_SCROLLBAR_NEVER);

最后Jpanel.add(JScrollPane)

转载于:https://juejin.im/post/5adc3525f265da0b851c713a