public void testSort3()方法報錯
public void testSort3(){
List<Student>studentList=new ArrayList<Student>();
Random random =new Random();
Integer k;
Integer k1;
Integer k2;
Integer k3;
for(int i=0;i<3;i++){
do{
k=random.nextInt(10);
}while(studentList.contains(k));
if(i==0){
k1=k;
}else if(i==1){
k2=k;
}else{
k3=k;
}
}
studentList.add(new Student(k1+"","Jike"));
studentList.add(new Student(k2+"","Angela"));
studentList.add(new Student(k3+"","Lucy"));
studentList.add(new Student(10000+"","Tom"));
為啥K1,k2,k3會報錯？
2017-01-16
未初始化 =null；
2022-03-27
親，這個標簽沒有效果。后面用css樣式可以給span標簽設置css樣式，就是相當與給“美國夢”這三個字來設置樣式。因為class是CSS樣式中的.red.green.blue，既然你改了id了,那就要給id賦予css樣式了