Java JTable header word wrap

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I am trying to get the header on a table to have word wrap. I have managed to do this but the first data row is expanding. The code for the table is:

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                  青春惊慌失措        
                
              
                            
                2021-01-03 07:23
              
            
            
                                                                       
You can achieve multi-line headers much easier.

As with many Swing components you can use HTML code. In HTML specify <br> elements to indicate where line breaks / new lines should occur.

For example if you use the following header values (column names):

String[] columnNames = {
    "<html>First<br>column</html>",
    "<html>Second<br>column</html>",
    "<html>Third<br>column</html>"
};


Then the headers will be properly rendered in 2 lines. You don't even need to create/use a custom header renderer, the default header renderer properly handles HTML code.

Note: The header height will be determined by the height of the first column. So you have to use a 2-line HTML value for the first column too. If you only have 1 word for the first column, you may additionally add an empty second line like this: "<html>Select<br>&nbsp;</html>"
                                                                        
                                                        
            
            
              
                
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