java 各种数据类型的互相转换

StringBuilder转化为String

	StringBuilder stb = new StringBuilder();

	String str=stb.toString();  //方法1

	String str=""+stb;  //方法2

​

String转化为StringBuilder

	String str = "abcdefghijklmnopqrs";

	StringBuilder stb = new StringBuilder(str);

整型数组转化为字符串

	StringBuilder s = new StringBuilder();

	for(i=1;i<=n;i++) {

		s.append(String.valueOf(a[i]));

	}

	String str = ""+s;

字符串转化为整形数组

	String str="123456";

	int[] a = new int[str.length()];

	for(int i=0;i<str.length();i++) {

		a[i]  = str.charAt(i)-'0';

	}

​

字符串转化为字符数组

	String str="123456";

	char[] c = str.toCharArray() ;

	System.out.println(c);

​

字符数组转化为字符串

	char[] c = {'a','s','d','4','5',};

	String str = new String(c);

	System.out.println(str);

​

字符数组转化为整型数组

	char[] c = { '1', '2', '3', '4', '5', };

	int[] a = new int[c.length];

	for (int i = 0; i < 5; i++) {

		a[i] = c[i] - '0';

		System.out.println(a[i]);

	}

​

整型数组转化为字符数组

	int[] a = {1,2,3,4,5};

	char[] c = new char[a.length];

	for (int i = 0; i < 5; i++) {

		c[i] = (char) (a[i]+'0');

		System.out.println(c[i]);

	}

​

​

整型数转化为字符串

1.String str = Integer.toString(i);

2.String s = String.valueOf(i);

3.String s = "" + i;

字符串转化为整型数

int i = Integer.valueOf(str).intValue();