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UseTextArea.java

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import java.awt.*;

import java.applet.*;

import java.applet.Applet;

public class UseTextArea extends Applet

{

String str1 = new String();

String str2 = new String();

int i1,i2,i3;

TextArea t1,t2,t3,t4,t5; //声明对象

public void init()

{

t1 = new TextArea();

t2 = new TextArea(2, 20);

t3 = new TextArea("文本区域对象3");

t4 = new TextArea("文本区域对象4", 3, 10);

t5 = new TextArea("文本区域对象5", 2, 24, TextArea.SCROLLBARS_BOTH);

this.add(t1);

this.add(t2);

this.add(t3);

this.add(t4);

this.add(t5);

}

public void start()

{

t1.setText("文本区域对象1");

t2.append("文本区域对象2");

t3.insert("\"插入3\"", 4);

str1 = t3.getText();

t4.replaceRange("\"替换\"", 2, 6);

str2 = t4.getText();

i1 = t4.getRows();

i2 = t5.getColumns();

i3 = t5.getScrollbarVisibility();

//t5.setEditable(false);

repaint();

}

public void paint(Graphics g)

{

g.drawString("第三个对象的文本内容为: " + str1, 40, 400);

g.drawString("第四个对象的文本内容为: " + str2, 40, 420);

g.drawString("第四个对象的行数为: " + i1, 40, 440);

g.drawString("第五个对象的列数为: " + i2, 40, 460);

g.drawString("第五个对象的滚动条情况为: " + i3, 40, 480);

}

}