The difference between valueOf, parseInt and toString in Java

1.parseInt() converts the String type into the int type.
Such as String a= "123";

int
 b = 
Integer
.parseInt(a);

This way b is equal to 123.

2.ValueOf() method, for example, Integer.valueOf() converts the String type into the Integer type (note: it is the Integer type, not the int type. The int type is a simple type that represents numbers, and the Integer type It is a complex type that refers to )
For example:

String a= "123";
Integer c =Integer.valueOf(a);
//Integer类型可以用int
Value方法
转化为int类型
int b =c.intValue();

At this time, b is equal to 123

String.valueOf(int) returns the string representation of the int parameter.

This representation happens to be the result returned by the single-parameter Integer.toString method.

3. toString() can convert a reference type into the String string type.
The following example is the opposite of 2, converting Integer into String type:

Integer a = 
new
 Integer(123);
String b =a.toString();

At this time, b is "123"

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