java的IO类源代码

java的IO类源代码 IO类的源代码 import javax.swing.JOptionPane; public class IO {public static void showMessage (String s) { JOptionPane.showMessageDialog (null,s); } public static void showValue (String s,double d) {JOptionPane.showMessageDialog (null,s+d); } public static void showValue (String s,float f) {JOptionPane.showMessageDialog (null,s+f); } public static void showValue (String s,int i) {JOptionPane.showMessageDialog (null,s+i); } public static void showValue (String s,char c) {JOptionPane.showMessageDialog (null,s+c); } public static void showValue (String s1,String s2) {IO.showMessage (s1+s2); } public static double readDouble (String prompt) {String s; s=JOptionPane.showInputDialog (prompt); return(Double.parseDouble(s)); } public static float readFloat (String prompt) {String s; s=JOptionPane.showInputDialog (prompt); return(Float.parseFloat(s)); } public static int readInt (String prompt) {String s; s=JOptionPane.showInputDialog (prompt); return(Integer.parseInt(s)); } public static char readChar (String prompt) {String s; s=JOptionPane.showInputDialog (prompt); if(s==null) return 0; else if(s.length ()>0) return s.charAt (0); else return '\n'; } public static String readString (String prompt) {return(JOptionPane.showInputDialog (prompt)); } public static String concatenate (String s1,String s2) {return(s1+s2); } public static String concatenate (String s1,double d) {return(s1+d); } } 注意:String中的“S”要大写。