String--->int (将字符串转换为整型)

str2Int.java

public int str2Int(String s) {
	// method1
	int n = Integer.parseInt(s);

	// method2
	int sum = 0;
	int t = 1;
	char[] c = s.toCharArray();
	for (int i = c.length - 1; i > -1; i--) {
		sum += (c[i] - '0') * t;
		t *= 10;
	}
	return sum;/* (or n) */
}