无限 while 循环给出 java.lang.OutOfMemoryError: Java heap space

Question

if i want to run a while loop up to infinity and i am getting Java heap space but i am using "system garbage cleaner " to clean up memory. so how can i solve this problem.

try{
    while(true){
        try{
            attach=sample.readMails();         
            System.gc();
        }
        catch (IOException e){
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.out.println("Error In  readMails-->downloads");
        }
    }
}catch (Exception e){
    // TODO Auto-generated catch block
    e.printStackTrace();
    System.out.println("Error In  Infinite While");
}

Answer 1

System.gc only works for unused objects. According to docs of System#gc

Calling the gc method suggests that the Java Virtual Machine expend effort toward recycling unused objects in order to make the memory they currently occupy available for quick reuse.