匿名网友
1、TRUE（大写）不是关键字
2、int a =10,b=20,c=11,d=17;
int K = a>b?a:c>d?d:b<c+d?b+c:d+a>a+c?d:b;（这后面整个都是一个表达式）
System.out.println(K); 31
3、以下定义的类，可以包外继承的有：
a. public final Class One
b. class Two
c. protected Class Three
d. Public Class Four
4、int i= 5/0; 编译没错，运行有错
5、public abstract class A{
public abstract void operation_1();
public void operation_2();
}
能符合以下类图的选项有：A B C E
a.public class A_1 extends A{
public void operation_1(){}
}
b.public abstract class A_2 extends A{
public void operation_1(){}
}
c.public abstract class A_3 extends A{
}
d.public class A_4 extends A{
}
e.public class A_5 extends A{
public void operation_1(){}
public void operation_2(){}
}
f.public class A_6{
private A a ;
}
6、 String[] arr1 ={“a”,”b”,”1″,”c”,”b”};
List lst1 = new ArrayList<String>();
lst1.add(“d”);
Collections.addAll(lst1,arr1);
System.out.println(lst1);
Set<String> set1 = new HashSet<String>();
set1.add(“d”);
Collections.addAll(set1, arr1);
System.out.println(set1);
运行结果: [d, a, b, 1, c, b]
[d, a, c, b, 1]
7、Short a = new Short(45); 编译有错
8、int[] arr = {1,3,3,2,8};
String str = “”;
int i=0;
public void doIt(){
for(;i<arr.length;){
if(arr[i]>arr[i+1]){
str=arr[i]+arr[i+1]+str;
break;
} else if(arr[i]<arr[i+1]){
str=arr[i]+str+arr[i+1];
i++;
continue;
} else{
str+=arr[i];
i++;
}
}
System.out.println(i);
System.out.println(str);
}
打印结果：i=2；str=5133
9、public class Final {
void play(String str){
class A{
String dose(short flag){
String a =””;
switch(flag){
case 1:
a+=”a”;
break;
case 32768:
a+=”b”;
break;
default :
flag=1;
a+=”c”;
continue;
}
System.out.println(str);
}
}
}
}
找错：①32768 超过short类型的
②最后输出str时有错，内部类调用的参数，必须是final修饰的
