java this作为实例参数的使用

1、代表自身对象

package GUI; import java.awt.*; import java.awt.event.*; import java.awt.event.ActionListener; /** * Created by ADY on 2016/11/17. */ public class TFMath { public static void main(String[] args){ new TMFrame().launchFrame(); } } class TMFrame extends Frame{ TextField num1,num2,num3; public void launchFrame(){ num1 = new TextField(10); num2 = new TextField(10); num3 = new TextField(15); // TextField test = new TextField(2); Label lbplus = new Label("+"); Button btequal = new Button("="); //this是当前类，当前对象。(既是TMFrame,包含的是成员变量num1、num2、num3) btequal.addActionListener(new TFMonitor(this)); setLayout(new FlowLayout()); add(num1); add(lbplus); add(num2); add(btequal); add(num3); pack(); setVisible(true); } } class TFMonitor implements ActionListener{ TMFrame tf = null; public TFMonitor(TMFrame tf){ this.tf = tf; } public void actionPerformed(ActionEvent e){ int n1 = Integer.parseInt(tf.num1.getText()); int n2 = Integer.parseInt(tf.num2.getText()); // " " 是一个字符串，字符串+int自动转成字符串 tf.num3.setText("" + (n1 + n2)); //int n3 = Integer.parseInt(tf.test.get) //tf.num1.setText(""); //tf.num2.setText(""); } } 2、引用构造方法 class student extends person{ private String school; student(String name,String school){ //super(name,location); this(name,"beijing",school); /**有显式this()调用的构造器就会抑制掉该构造器里隐式的super()调用。注意this()和 this.不一样。 this()调用本类中另一种构造方法，this()必须是构造方法的第一句 super()调用基类的一种构造方法，super()必须是构造方法的第一句 this：表示当前对象名 super：表示引用当前对象父类中的成员 */ } student(String n,String l,String school){ super(n,l); this.school = school; } }