java SWT實現最簡單的加法器

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從這裡學的

難點：怎樣把輸入字串轉換成double型

import org.eclipse.swt.swt;

public class test  catch (exception e) 
}	/**
* open the window.
*/public void open() 
}	}/**
* create contents of the window.
*/protected void createcontents() 
});			
b1.setbounds(0, 10, 80, 27);
b1.settext("begin");
t1 = new text(shell, swt.border);
t1.setbounds(7, 65, 73, 23);
t2 = new text(shell, swt.border);
t2.setbounds(155, 65, 73, 23);
t3 = new text(shell, swt.border);
t3.setbounds(304, 65, 73, 23);			
label lblnewlabel = new label(shell, swt.none);
lblnewlabel.setbounds(123, 68, 61, 17);
lblnewlabel.settext("+");
label lblnewlabel_1 = new label(shell, swt.none);
lblnewlabel_1.setbounds(259, 68, 61, 17);
lblnewlabel_1.settext("=");
}}

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