src/java.desktop/share/classes/java/awt/TextField.java

*** 196,206 ****
       * @exception HeadlessException if GraphicsEnvironment.isHeadless()
       * returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       */
      public TextField(String text, int columns) throws HeadlessException {
!         super(text);
          this.columns = (columns >= 0) ? columns : 0;
      }
  
      /**
       * Construct a name for this component.  Called by getName() when the
--- 196,206 ----
       * @exception HeadlessException if GraphicsEnvironment.isHeadless()
       * returns true.
       * @see java.awt.GraphicsEnvironment#isHeadless
       */
      public TextField(String text, int columns) throws HeadlessException {
!         super(replaceEOL(text));
          this.columns = (columns >= 0) ? columns : 0;
      }
  
      /**
       * Construct a name for this component.  Called by getName() when the
*** 295,311 ****
       * text component to be the specified text.
       * @param       t   the new text.
       * @see         java.awt.TextComponent#getText
       */
      public void setText(String t) {
!         super.setText(t);
  
          // This could change the preferred size of the Component.
          invalidateIfValid();
      }
  
      /**
       * Indicates whether or not this text field has a
       * character set for echoing.
       * <p>
       * An echo character is useful for text fields where
       * user input should not be echoed to the screen, as in
--- 295,327 ----
       * text component to be the specified text.
       * @param       t   the new text.
       * @see         java.awt.TextComponent#getText
       */
      public void setText(String t) {
!         super.setText(replaceEOL(t));
  
          // This could change the preferred size of the Component.
          invalidateIfValid();
      }
  
      /**
+      * Replaces EOL characters from the text variable with a space character.
+      * @param       text   the new text.
+      * @return      Returns text after replacing EOL characters.
+      */
+     private static String replaceEOL(String text) {
+         String[] strEOLs = {System.lineSeparator(), "\n"};
+         for (String eol : strEOLs) {
+             if (text.contains(eol)) {
+                 text = text.replace(eol, " ");
+             }
+         }
+         return text;
+     }
+ 
+ 
+     /**
       * Indicates whether or not this text field has a
       * character set for echoing.
       * <p>
       * An echo character is useful for text fields where
       * user input should not be echoed to the screen, as in
*** 702,711 ****
--- 718,728 ----
      private void readObject(ObjectInputStream s)
        throws ClassNotFoundException, IOException, HeadlessException
      {
          // HeadlessException will be thrown by TextComponent's readObject
          s.defaultReadObject();
+         text = replaceEOL(text);
  
          // Make sure the state we just read in for columns has legal values
          if (columns < 0) {
              columns = 0;
          }