达内学习的java类库01

来源：互联网发布：苹果越狱音乐软件编辑：程序博客网时间：2024/05/29 02:31

java api介绍

1.字符串输出api

package demo01;import java.util.Arrays;public class Demo01 {public static void main(String[] args) {int[] ary = new int[5];System.out.println(Arrays.toString(ary));}}

2.字符串内容比较和从小到大排序的api

package demo01;import java.util.Arrays;public class Demo01 {public static void main(String[] args) {char[] answer = {'A', 'C', 'D'};char[] input = {'A', 'C', 'D'};char[] one = {'C', 'D', 'A'};//判断两个字符串是否相等System.out.println(Arrays.equals(input, one));//对字符串进行排序， 这个排序是从小到大排序Arrays.sort(one);System.out.println(Arrays.equals(input, one));}}

3.大整数的运算

package demo01;import java.math.BigInteger;public class Demo01 {public static void main(String[] args) {String i = "399999999999999999999999999333300000";BigInteger s = new BigInteger("1");//BigInteger参数必须是字符串BigInteger x = new BigInteger("" + i);//大整数乘法必须调用方法完成计算s = s.multiply(x);System.out.println(s);//大整数加法调用方法完成计算s = s.add(x);System.out.println(s);}}

程序代码都是经过我的电脑的编译并运行的可以执行的程序代码......

0 0