yonggc耗时越久，string pool泄露

yonggc耗时越久，string pool泄露

https://www.cnblogs.com/halberts/p/7473857.html

import sun.jvm.hotspot.memory.StringTable;
import sun.jvm.hotspot.memory.SystemDictionary;
import sun.jvm.hotspot.oops.Instance;
import sun.jvm.hotspot.oops.InstanceKlass;
import sun.jvm.hotspot.oops.OopField;
import sun.jvm.hotspot.oops.TypeArray;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.tools.Tool;
public class PrintStringTable extends Tool {
    public PrintStringTable() {
    }
    public static void main(String args[]) throws Exception {
        if (args.length == 0 || args.length > 1) {
            System.err.println("Usage: java PrintStringTable ");
            System.exit(1);
        }
        PrintStringTable pst = new PrintStringTable();
        pst.execute(args);
        pst.stop();
    }
    @Override
    public void run() {
        StringTable table = VM.getVM().getStringTable();
        table.stringsDo(new StringPrinter());
    }
    class StringPrinter implements StringTable.StringVisitor {
        private final OopField stringValueField;
        public StringPrinter() {
            InstanceKlass strKlass = SystemDictionary.getStringKlass();
            stringValueField = (OopField) strKlass.findField("value", "[C");
        }
        @Override
        public void visit(Instance instance) {
            TypeArray charArray = ((TypeArray) stringValueField.getValue(instance));
            StringBuilder sb = new StringBuilder();
            for (long i = 0; i < charArray.getLength(); i++) {
                sb.append(charArray.getCharAt(i));
            }
            System.out.println("Address: " + instance.getHandle() + " Content: " + sb.toString());
        }
    }
}