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並前往http://bpg.utoledo.edu/~afedorov/calculator/prog6_calc.java

prog6_calc.java - The University of Toledo

addActionListener(this); bcl = new JButton("Bk"); bcl. ... getText(); int len = x.length(); if(len>0){x = x.substring(0, len-1);} else{}; ta1.

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