String and integer convert each other

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//String transformation Integer
String str = "a";
Integer i = null;
if(str!=null){
     i = Integer.valueOf(str);
}

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// Method 1 :Integer Class static methods toString():
Integer a = 2;
String str = Integer.toString(a)

// Method 2 :Integer Member methods of class toString():
Integer b = 2;
String str = b.toString();

// Method 3 :String Class static methods valueOf():
Integer c = 2;
String str = String.valueOf(c);

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