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As we discussed earlier, no streaming happens until the terminal operation executes. This gives the JVM an overall picture of the stream pipeline, thereby enabling efficiencies to be introduced in the background.
A terminal operation can be performed without any intermediate operation but not the other way around. Reductions are a special type of terminal operation where all of the contents of the stream are combined into a single primitive or Object (for example, a Collection).
Table 15.1 represents the terminal operations we will be discussing in this section:
Table 15.1 – Terminal operations
Before we discuss them in turn, a brief discussion regarding the table. Remember, a reduction must look at all elements in the stream and then return a primitive or Object
.
Some of these terminal operations, such as allMatch(Predicate)
, may not look at all of the elements in the stream. For example, let’s say...