Java中string转int&int转String

Java中string转int&int转String

string转int

public class TypeChange {
    public static void main(String[] args) {
        String s = "12345";
        //方法一：用Integer类自带的valueOf()方法
        int i1 = Integer.valueOf(s);
        System.out.println(i1);

        //方法二：用Integer类自带的paresInt()方法
        int i2 = Integer.parseInt(s);
        System.out.println(i2);
    }
}

int转string

public class TypeChange {
    public static void main(String[] args) {
        int a = 12345;

        //方法一：用Integer类自带的toString方法
        String s1 = Integer.toString(a);
        System.out.println(s1);
        System.out.println(s1.length());

        //方法二：用String类自带的valueOf方法
        String s2 = String.valueOf(a);
        System.out.println(s2);
        System.out.println(s2.length());

        //方法三：自动转换
        String s3 = a + "";
        System.out.println(s3);
        System.out.println(s3.length());
    }
}