Java核心代码（五） 实用代码块

1、循环接受键盘输入，并可以退出

 

        BufferedReader in = new BufferedReader( new InputStreamReader( System.in ) );
        while ( true ) {
            String line = in.readLine();
            if ( "bye".equals( line ) )break;
        }

 

2、打印调用栈

static void printStackTrack() {
    StackTraceElement[] traces = Thread.currentThread().getStackTrace();
    if ( null == traces || 0 == traces.length ){
        return;
    }
    for ( StackTraceElement trace : traces ) {
        if ( null == trace )
            continue;
        System.out.println("class="+trace.getClassName()+","+ trace.getMethodName()+",line="+trace.getLineNumber() );
    }
}

 

 3、打印java属性

System.getProperties().list(System.out);

 

4、定位AWT-Swing-UI

.setBorder(BorderFactory.createLineBorder(Color.RED));

弹出对话框：
JOptionPane.showMessageDialog( null, "msg","title", JOptionPane.OK_OPTION,IconURL );