import java.util.*;ArrayList list = new ArrayList(); for (long i = 0; i < 100; i++) { list.add(new Long(i)); }long n = ((Long) list.get(3)).longValue();
如果是 Java 5.0 版本,代码可以写成这样: import java.util.*;public class Test {
public static void main(String[] args) { ArrayList<Long> list = new ArrayList<Long>(); for (long i = 0; i < 100; i++) { list.add(new Long(i)); }
for (long i = 0; i < 100; i++) {
list.add(new Long(i));
}long n = ((Long) list.get(3)).longValue();
import java.util.*;public class Test {
public static void main(String[] args) {
ArrayList<Long> list = new ArrayList<Long>();
for (long i = 0; i < 100; i++) {
list.add(new Long(i));
}
long n = list.get(5).longValue();
System.out.println(n);
}
}
1、把long型的数据转换为Long型的对象
2、把long型的数据转换为String对象
1、把long型的数据转换为Long型的对象
2、把long型的数据转换为String对象