pta期末答案

6-1 jmu-Java-06异常-多种类型异常的捕获

catch(NumberFormatException e){
    System.out.println("number format exception");
    System.out.println(e);
}catch(IllegalArgumentException e){
    System.out.println("illegal argument exception");
    System.out.println(e);
}catch(Exception e){
    System.out.println("other exception");
    System.out.println(e);
}
 

6-3 static属性成员

class Student{
static int dubianyifei=0;
public Student( ){
dubianyifei++;
System.out.println("当前的Student总人数是："+dubianyifei);
}
}

6-4 equals方法 

public boolean equals(Object obj) {
if (obj.getClass().equals(this.getClass())) {
Point that = (Point) obj;
if (this.xPos == that.xPos && this.yPos ==that.yPos)
return true;
}
return false;
}

6-5 匿名内部类 

new IODevice(){
public void out(){
System.out.println("this is print out");
}
public void getData(String msg){
System.out.println("the print getdata:"+msg);
}