Example usage for java.util HashMap HashMap

Introduction

In this page you can find the example usage for java.util HashMap HashMap.

Prototype

public HashMap(Map<? extends K, ? extends V> m) 

Source Link

Document

Constructs a new HashMap with the same mappings as the specified Map .

Usage

From source file:com.heliosapm.tsdblite.metric.Trace.java

@SuppressWarnings("javadoc")
public static void main(String[] args) {
    log("Trace Test");
    Map<String, String> tags = new HashMap<String, String>(4);
    tags.put("host", "localhost");
    tags.put("app", "test");
    tags.put("cpu", "" + 1);
    tags.put("type", "combined");
    final Trace trace = new Trace("sys.cpu", tags, false, 34, -1, System.currentTimeMillis());
    log("toString: " + trace);
    String json = JSON.serializeToString(trace);
    log("JSON: " + json);
    final Trace t = JSON.parseToObject(json, Trace.class);
    log("fromJson: " + t);
    log("=====================================");
    final Trace[] traces = new Trace[Constants.CORES];
    final Random r = new Random(System.currentTimeMillis());
    for (int i = 0; i < Constants.CORES; i++) {
        tags = new HashMap<String, String>(4);
        tags.put("host", "localhost");
        tags.put("app", "test");
        tags.put("cpu", "" + i);
        tags.put("type", "combined");
        traces[i] = new Trace("sys.cpu", tags, false, Math.abs(r.nextInt(100)), -1, System.currentTimeMillis());
        log("toString:" + traces[i]);
    }/*  w w w. j  ava  2s . c om*/
    json = JSON.serializeToString(traces);
    log("JSON: " + json);
    Trace[] ts = JSON.parseToObject(json, Trace[].class);
    for (Trace x : ts) {
        log("fromJson: " + x);
    }
}

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