From dd87efa2994cf47f390e2c6a3af65dae4a68e898 Mon Sep 17 00:00:00 2001
From: younies <younies@chromium.org>
Date: Thu, 22 Oct 2020 09:45:47 +0000
Subject: [PATCH] ICU-21308 Fix icu4j build for Java 7 in MeasureUnitImpl

See #1428
---
 .../core/src/com/ibm/icu/impl/units/MeasureUnitImpl.java       | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/icu4j/main/classes/core/src/com/ibm/icu/impl/units/MeasureUnitImpl.java b/icu4j/main/classes/core/src/com/ibm/icu/impl/units/MeasureUnitImpl.java
index bbec372ff70..ba1dae15627 100644
--- a/icu4j/main/classes/core/src/com/ibm/icu/impl/units/MeasureUnitImpl.java
+++ b/icu4j/main/classes/core/src/com/ibm/icu/impl/units/MeasureUnitImpl.java
@@ -4,6 +4,7 @@ package com.ibm.icu.impl.units;
 
 import java.math.BigDecimal;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 
 import com.ibm.icu.util.BytesTrie;
@@ -224,7 +225,7 @@ public class MeasureUnitImpl {
         }
         if (this.complexity == MeasureUnit.Complexity.COMPOUND) {
             // Note: don't sort a MIXED unit
-            this.getSingleUnits().sort(new SingleUnitComparator());
+            Collections.sort(this.getSingleUnits(), new SingleUnitComparator());
         }
 
         StringBuilder result = new StringBuilder();