1.String s=n+"";
2.String s=String.valueOf(n);
3.String s = Integer.toString(n);
需要注意的是:三种转换的方法获取到的字符串的长度是一样的
int n = 1234567;
String s1 = "" + n;
char[] c1 = s1.toCharArray();
System.out.println("s1长度为: " + c1.length);
String s2 = String.valueOf(n);
char[] c2 = s2.toCharArray();
System.out.println("s2长度为:" + c2.length);
String s3 = Integer.toString(n);
char[] c3 = s3.toCharArray();
System.out.println("s3长度为:" + c3.length);
输出结果为: