how to replace "(double quotes) in a string with \" in java | How do I retrieve query parameters in a Spring Boot controller? | Storing a new object as the value of a hashmap?

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how to replace "(double quotes) in a string with \" in java

Example -

str = str.replace("\"", "\\\"")

Avoid using replaceAll since it uses regex syntax in description of what to replace and how to replace, which means that \ will have to be escaped in string "\\" but also in regex \\ (needs to be written as "\\\\" string) which means that we would need to use.

str = str.replaceAll("\"", "\\\\\"");
str = str.replaceAll("\"", Matcher.quoteReplacement("\\\""))

How do I retrieve query parameters in a Spring Boot controller?

Use @RequestParam

@RequestMapping(value="user", method = RequestMethod.GET)
public @ResponseBody Item getItem(@RequestParam("data") String empId){

    Emp i = empDao.findOne(empId);              
    String EmpName = i.getEmpName();
    String dept= i.getDept();
    return i;
}

Storing a new object as the value of a hashmap?


HashMap mapper = new HashMap();
mapper.put("Satya", new Emp("Satya"));
...

Emp value = mapper.get("Satya");
Integer memory = value.getMemory();

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