private static final String intKeyValToStringConcat(int a, int b) {
return a + " -> " + b;
}
private static final String intKeyValToStringSBuild(int a, int b) {
StringBuilder sb = new StringBuilder(20);
sb.append(a).append(" -> ").append(b);
return sb.toString();
}
private static final String intKeyValToStringFormat(int a, int b) {
return String.format("%d -> %d", a, b);
}