java数据类型转化

public class test {

	public static void main(String[] args) throws Exception {
		// int---->String
		int a = 10;
		String str = a + "";
		String str1 = String.valueOf(a);
		String str2 = Integer.toString(a);
		System.out.println(str + " " + str1 + " " + str2);
		// String---->int
		String s = "123";
		int b = Integer.parseInt(s);
		int c = Integer.valueOf(s);
		System.out.println(b);
		// Stirng---->char[]
		String str3 = "abc";
		char[] ch = new char[str3.length()];
		for (int i = 0; i < str3.length(); i++) {
			ch[i] = str3.charAt(i);
		}
	}
}