如何更改 java 小程序中的 drawString 字体颜色

Question

我为我的 java 小程序编写了一个绘制方法，这允许我的 drawString 将颜色更改为用户在三个文本字段（R、G、B）中输入的任何内容。我的默认字体颜色是黑色，但是我试图将其更改为绿色但不能，因为要更改字体颜色，我必须编写 g.setColor(mixColor)。那么有谁知道当我运行我的小程序而不是黑色时如何使字体颜色以绿色开始。

import java.awt.*;
import java.awt.event.*;
import java.applet.*;





public class text2 extends Applet implements ActionListener
{

Font textFont;

TextField T1;
TextField T2;
TextField T3;
int redColor, greenColor, blueColor;
String as, ag, ab;
Button bttn;
Button bttn2;

public void init() {

    // This routine is called by the system to initialize
    // the applet.  It sets up the font and initial colors
    // the applet.  It adds a button to the applet for
    // changing the message color.

    setBackground(Color.lightGray);

    // The applet is filled with the background color before
    // the paint method is called.  The button and the message
    // in this applet will appear on a light gray background.

    redColor=0;
    greenColor=0;
    blueColor=0;


    textFont = new Font("Serif",Font.BOLD,24);


    T1 = new TextField("",12);
    T2 = new TextField("",12);
    T3 = new TextField("",12);




    add(T1);
    add(T2);
    add(T3);

    bttn = new Button("Change Colour");
    bttn2 = new Button("Reset");
    // Create a new button.  "ChangeColour" is the text
    // displayed on the button.

    bttn.addActionListener(this);
    bttn2.addActionListener(this);
    // Set up bttn to send an "action event" to this applet
    // when the user clicks the button

    add(bttn);
    add(bttn2);



    // Add the button to the applet, so that it
    // will appear on the screen.

}  


public void paint(Graphics g) {

    // This routine is called by the system whenever the content
    // of the applet needs to be drawn or redrawn.  It displays
    // my name and reg number in the proper colour and font.
    this.bttn2.setLocation(600, 600);
    Color mixColor = new Color(redColor, greenColor,blueColor);
    g.setColor(mixColor);
    g.setFont(textFont);       // Set the font.
    g.drawString("Welcome to my applet by: Joshua", 330, 300);

}  


public void actionPerformed(ActionEvent e) {

    // This routine is called by the system when the user clicks
    // on the button.  The response is to change the colorNum
    // which determines the color of the message, and to call
    // repaint() to see that the applet is redrawn with the
    // new color.


    if (e.getSource() == bttn2) {
        T1.setText(null);
        T2.setText(null);
        T3.setText(null);

    }

    if (e.getSource() == bttn)
    {

        as=T1.getText();
        ag=T2.getText();
        ab=T3.getText();
        as=as.trim();
        ag=ag.trim();
        ab=ab.trim();

        redColor= Integer.parseInt(as);
        greenColor= Integer.parseInt(ag);
        blueColor= Integer.parseInt(ab);

        repaint();  // Tell system that this applet needs to be redrawn
    }


}

}

Answer 1

您可以使用 'java.awt' 包的 setColor() 方法来完成

  import java.applet.Applet; 
  import java.awt.*;
  public class Applet1 extends Applet {
      /* In applets there is NO 'main() ' */
      @Override
      public void paint(Graphics g) {
          //create color objects using constructor
          Color red = new Color(255,0,0);
          Color blue = new Color(0,0,255);
          Color black = new Color(0,0,0);
          //create font objects using constructor
          Font myFontBold = new Font("Courier", Font.BOLD ,20);
          Font myFontPlain = new Font("Courier", Font.BOLD ,20);
          //set font , by passing the font object as
          // argument to       the setFont() method
          g.setFont(myFontBold);
          //set font color by passing the color object as 
          //argument to the setColor() method
          g.setColor(Color.blue);
          g.drawString("Name ",25,20); 
          g.setFont(myFontPlain);
          g.setColor(Color.black);
          g.drawString(": Ashutosh K Singh",325,20);
      }
  }

Answer 2

您可以使用setForeground 方法。语法是setForeground(Color.green)。您可以使用颜色值代替绿色。