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java问题

java 用很多内存，占用全部的cpu：

{Heap before GC invocations=3629 (full 101):
 PSYoungGen      total 699392K, used 350208K [0x0000000780000000, 0x00000007c0000000, 0x00000007c0000000)
  eden space 350208K, 100% used [0x0000000780000000,0x0000000795600000,0x0000000795600000)
  from space 349184K, 0% used [0x00000007aab00000,0x00000007aab00000,0x00000007c0000000)
  to   space 349184K, 0% used [0x0000000795600000,0x0000000795600000,0x00000007aab00000)
 ParOldGen       total 2097152K, used 2097081K [0x0000000700000000, 0x0000000780000000, 0x0000000780000000)
  object space 2097152K, 99% used [0x0000000700000000,0x000000077ffee728,0x0000000780000000)
 Metaspace       used 69136K, capacity 72006K, committed 73560K, reserved 1114112K
  class space    used 7517K, capacity 8088K, committed 8320K, reserved 1048576K

{Heap before GC invocations=3629 (full 101):

PSYoungGen total 699392K, used 350208K [0x0000000780000000, 0x00000007c0000000, 0x00000007c0000000)

eden space 350208K, 100% used [0x0000000780000000,0x0000000795600000,0x0000000795600000)

from space 349184K, 0% used [0x00000007aab00000,0x00000007aab00000,0x00000007c0000000)

to space 349184K, 0% used [0x0000000795600000,0x0000000795600000,0x00000007aab00000)

ParOldGen total 2097152K, used 2097081K [0x0000000700000000, 0x0000000780000000, 0x0000000780000000)

object space 2097152K, 99% used [0x0000000700000000,0x000000077ffee728,0x0000000780000000)

Metaspace used 69136K, capacity 72006K, committed 73560K, reserved 1114112K

class space used 7517K, capacity 8088K, committed 8320K, reserved 1048576K

& …

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golang 中的只读变量

示例：

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package proxy

import (
	"net"
)

type direct struct{}

// Direct is a direct proxy: one that makes network connections directly.
var Direct = direct{}

func (direct) Dial(network, addr string) (net.Conn, error) {
	return net.Dial(network, addr)
}